What is the benefit of the parallel signature scanning feature in Cisco IOS IPS software?

A.
scans multiple patterns within a Signature Micro Engine at any given time

B.
scans traffic patterns serially and correlates the events in parallel

C.
dynamically runs detection scanning rules in parallel within a Signature Micro Engine to increase IPS performance

D.
runs currently configured scanning rules in parallel while updating new signature definition files to reduce the risk of day-zero attacks