Explanation/Reference:
The firewall uses file blocking profiles two ways: to forward files to WildFire for analysis or to block specified file types over specified applications and in the specified session flow direction (inbound/ outbound/both). You can set the profile to alert or block on upload and/or download and you can specify which applications will be subject to the file blocking profile. You can also configure custom block pages that will appear when a user attempts to download the specified file type. This allows the user to take a moment to consider whether or not they want to download a file.
Incorrect Answers:
D: Use a WildFire analysis profile to enable the firewall to forward unknown files or email links for WildFire analysis. Specify files to be forwarded for analysis based on application, file type, and transmission direction (upload or download).
References: https://www.paloaltonetworks.com/documentation/61/pan-os/pan-os/policy/file-blocking- profiles