Which Cisco IPS signature parameter cannot be edited using IDM?

A.
signature name

B.
signature engine type

C.
signature type

D.
vulnerable OS list

E.
event count key

Explanation:
http://www.cisco.com/en/US/docs/security/security_management/cisco_security_manager/securi ty_manager/4.0.1/user/guide/ipsvchap.html