Access to which feature requires the PAN-OS Filtering license?

Access to which feature requires the PAN-OS Filtering license?
A . PAN-DB database
B . DNS Security
C . Custom URL categories
D . URL external dynamic lists

Answer: A

Explanation:

Reference: https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-admin/getting-started/activate-licenses-andsubscriptions.html