How are Application Filters or Application Groups used in firewall policy?

How are Application Filters or Application Groups used in firewall policy?
A . An Application Group is a static way of grouping applications and cannot be configured as a nested member of Application Group.
B. An Application Group is a dynamic way of grouping applications and can be configured as a nested member of an Application Group.
C. An Application Filter is a dynamic way to group applications and can be configured as a nested member of an Application Group.
D. An Application Filter is a static way of grouping applications and can be configured as a nested member of an Application Group.

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Answer: C