What application override action must be configured to block all video and audio application traffic but allow access to CNN videos?

In this scenario, the objective is to block all video and audio application traffic while specifically allowing access to CNN videos. The correct choice involves enabling access to certain content amidst a broader range of restrictions.

Selecting to "Allow" the specific traffic from CNN is necessary because it creates an exception within the overall block policy applied to video and audio applications. By configuring the application override action to allow, you are effectively creating a whitelist condition for CNN videos, which will permit users to access that specific content even while general restrictions are in place for all other video and audio traffic.

The other actions, such as "Block," would prevent all traffic, including access to CNN videos, contrary to the requirement. "Monitor" would not actively control or restrict access but merely log the traffic, and "Redirect" would send traffic to a different location rather than allowing it. Hence, choosing the "Allow" action is crucial for meeting the specified needs of this scenario.