Which statement is a benefit of using Cisco IOS IPS?

Which statement is a benefit of using Cisco IOS IPS?

A.
It uses the underlying routing infrastructure to provide an additional layer of security.

B.
It works in passive mode so as not to impact traffic flow.

C.
It supports the complete signature database as a Cisco IPS sensor appliance.

D.
The signature database is tied closely with the Cisco IOS image.