The effectiveness of virus detection software is MOST dependent on which of the following?

A.
Packet filtering

B.
Intrusion detection

C.
Software upgrades

D.
Definition tables

Explanation:

The effectiveness of virus detection software depends on virus signatures which are stored in virus definition tables. Software upgrades are related to the periodic updating of the program code, which would not be as critical. Intrusion detection and packet filtering do not focus on virus detection.