Which statement is true regarding Cisco IOS IPS performance and capabilities?

Which statement is true regarding Cisco IOS IPS performance and capabilities?

A.
Cisco IOS IPS signatures have a minimal impact on router memory.

B.
Cisco IOS IPS uses a parallel signature-scanning engine to scan for multiple patterns within a signature micro-engine at any given time.

C.
Cisco IOS IPS offers a wider signature coverage than the IDSM-2 module.

D.
All Cisco IOS IPS signatures should be enabled to maximize the coverage, except for false-positives reduction.