B is my choice:
Cisco Stealthwatch, now known as Cisco Secure Network Analytics, is a network security analytics platform that provides visibility and threat detection across the entire network, including encrypted traffic. Encrypted Traffic Analytics (ETA) is a feature within Stealthwatch that analyzes encrypted traffic to identify potential threats without decrypting the data.
I think this link leaves the answer very clear. Just read the title:
https://blogs.cisco.com/security/cisco-stealthwatch-becomes-the-only-security-analytics-product-to-detect-threats-across-private-networks-public-clouds-and-encrypted-traffic
Secure Network Analytics (formerly Stealthwatch) is the only solution that detects threats across your private network, public clouds, and even in encrypted traffic.
https://www.cisco.com/c/en_hk/products/security/stealthwatch/index.html#~features
I vote of as as per ETA guide:
https://www.cisco.com/c/dam/en/us/td/docs/solutions/CVD/Campus/eta-sda-fabric-deployment-guide-2019sep.pdf
About Solution:
...
ETA focuses on identifying malware communications in encrypted traffic through passive monitoring, the extraction of
relevant data elements, and supervised machine learning with cloud-based global visibility.
ETA extracts two main data elements: The Initial Data Packet (IDP) and the Sequence of Packet Length and Time (SPLT).
What you need to enable Encrypted Traffic Analytics
To use Encrypted Traffic Analytics, you need one of the Cisco network devices below and Secure Network Analytics (formerly Cisco Stealthwatch).
Although you're saying in your comments that "....Stealthwatch is apart of ETA architecture", you're also contradicting yourself here in this very statement because in essence, you're telling me that if I need to ENABLE ETA, then I would need either a Cisco Catalyst or ASR series (network device) ALONG WITH Cisco Stealthwatch as PREQREQUISITIES.
You are wrong, it is the other way around Stealthwatch is part of ETA architecture - hence the correct answer is A:
https://www.cisco.com/c/en/us/solutions/enterprise-networks/enterprise-network-security/eta.html
https://www.cisco.com/c/dam/en/us/td/docs/solutions/CVD/Campus/eta-sda-fabric-deployment-guide-2019sep.pdf
It's actually the other way around....
"Our latest version of Stealthwatch includes new apps, one of which allows you to easily audit your network for cryptographic compliance. This app helps to analyze encrypted traffic for cryptographic compliance, using the Encrypted Traffic Analytics (ETA) technology. It provides an assessment of the “quality” of encryption being used, which is helpful to audit cryptographic compliance, for example, using SSL or early TLS violates PCI compliance. It also helps to understand trends and changes in the amount and type of encryption."
You can clearly see here from this statement that ETA is an app that is COMPLEMENTARY to Cisco Stealthwatch.
https://blogs.cisco.com/security/cisco-stealthwatch-becomes-the-only-security-analytics-product-to-detect-threats-across-private-networks-public-clouds-and-encrypted-traffic
The following table lists the minimum version and components required for Cisco Stealthwatch and Cisco DNA Center in order to deploy NaaS (Network as a Sensor) and ETA using the SSA(Stealthwatch Security Analytics) Application
Stealthwatch is the only solution that detects threats across your private network, public clouds, and even in encrypted traffic.
https://www.g2.com/products/cisco-secure-cloud-analytics-stealthwatch-cloud/reviews
A.Cisco Encrypted Traffic Analytics (ETA) is the best solution to detect threats across a private network, public clouds, and encrypted traffic. ETA uses machine learning and behavioral analysis to detect threats in encrypted traffic, without the need for decryption. It provides visibility into encrypted traffic flows, and uses this information to identify and block malicious traffic. ETA is an add-on to Cisco Stealthwatch, that helps to detect and respond to threats on the network, in public clouds and across encrypted traffic. It's a solution specifically designed to detect and prevent threats on encrypted traffic, which makes it the best answer for this question.
Cisco ETA provides visibility and threat detection specifically on encrypted traffic, it uses machine learning and behavioral analysis to detect threats in encrypted traffic, without the need for decryption.
Cisco Stealthwatch provides visibility and security analytics across the network and cloud infrastructure, it can monitor and detect malicious activities, such as lateral movement, data exfiltration, and other threats, across your network and cloud infrastructure.
So, if you specifically looking for visibility and threat detection on encrypted traffic, ETA is the best answer. But if you are looking for visibility and security analytics across the network and cloud infrastructure, Stealthwatch is the best answer.
Cisco Stealthwatch is a solution that detects threats across a private network, public clouds, and encrypted traffic.
Cisco Stealthwatch is a network security and threat detection platform that helps organizations protect their networks and data from cyber threats. It uses advanced analytics and machine learning to continuously monitor network traffic and identify suspicious activity, such as malware infections, data exfiltration, and other threats. Stealthwatch can detect threats across a private network, public clouds, and encrypted traffic, providing organizations with a comprehensive view of their security posture and helping them to respond quickly to potential threats.
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