Which parameter is used to configure a signature to fire if the activity it detects happens a certain number of times for the same address set within a specified
period of time?

A.
event action

B.
event counter

C.
summary count

D.
summary key

Explanation:
http://www.cisco.com/en/US/docs/security/security_management/cisco_security_manager/securi ty_manager/4.1/user/guide/ipsvchap.pdf