A. PGP
PGP (Pretty Good Privacy) is a widely recognized and highly secure encryption protocol that is commonly used for securing email communications. It provides end-to-end encryption, which means that the message is encrypted at the sender's end and can only be decrypted by the intended recipient using their private key.
Other options are not for email protection.
PPTP (Point-to-Point Tunneling Protocol) is primarily used for creating virtual private network (VPN) connections, but it does not provide built-in email encryption capabilities. It encapsulates data within an encrypted tunnel, but this encryption is meant to protect the integrity of transmitted data rather than specifically encrypting email contents.
IPSec (Internet Protocol Security) is also commonly used for VPNs and offers strong security features. However, it operates at the network layer rather than the application layer where emails reside. Although it can be configured to encrypt email traffic between networks or systems, implementing IPSec solely for email encryption may require additional configuration and setup.
NTFS (New Technology File System), on the other hand, is a file system used in Windows operating systems for organizing and storing files on disk drives. NTFS does not have native capabilities for encrypting emails.
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