B and C.
Please note: a custom app IS NOT REQUIRED to do an application override. you can override the built-in app, per the KB article.
"What You'll Need for Setup
To configure an Application Override, go to Policies > Application Override in the WebGUI. For setup, you'll need the following:
Custom Application to be used in the Application Override policy (recommended)
Application Override policy
Security Policy that allows the newly created Custom Application through the firewall
Special Note about Content and Threat inspection
Application Override to a custom application will force the firewall to bypass Content and Threat inspection for the traffic that is matching the override rule. The exception to this is when you override to a pre-defined application that supports threat inspection. "
https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000ClVLCA0
Once the custom application object has been created, it requires two additional things before it will be used by the Palo Alto firewall:
There must be a security policy in place that permits the traffic (unless this is a new site or recently added subnet, this should already exist)
There must be an application override policy that specifies when the custom application object should be used There must be an application override policy that specifies when the custom application object should be used
D - not necessary, cause:
Policies : Policies > Application Override : Application Override Protocol/Application Tab:
"Application - Select the override application for traffic flows that match the above rule criteria. When overriding to a custom application, there is no threat inspection that is performed. The exception to this is when you override to a pre-defined application that supports threat inspection."
For setup, you'll need the following:
Custom Application to be used in the Application Override policy (recommended)
Application Override policy
Security Policy that allows the newly created Custom Application through the firewall
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