How would you accomplish this goal?

You want to verify that all application traffic traversing your SRX device uses standard ports.
For example, you need to verify that only DNS traffic runs through port 53, and no other
protocols. How would you accomplish this goal?

A.
Use an IDP policy to identify the application regardless of the port used.

B.
Use a custom ALG to detect the application regardless of the port used.

C.
Use AppTrack to detect the application regardless of the port used.

D.
Use AppID to detect the application regardless of the port used.

Explanation: