Which of the following append themselves to files as a protection against viruses?

A.
Behavior blockers

B.
Cyclical redundancy checkers (CRCs)

C.
Immunizers

D.
Active monitors

Explanation:

I mmunizers defend against viruses by appending sections of themselves to files. They continuously
check the file for changes and report changes as possible viral behavior. Behavior blockers focus on
detecting potentially abnormal behavior, such as writing to the boot sector or the master boot
record, or making changes to executable files. Cyclical redundancy checkers compute a binary
number on a known virus-free program that is then stored in a database file. When that program is
subsequently called to be executed, the checkers look for changes to the files, compare it to the
database and report possible infection if changes have occurred. Active monitors interpret DOS and
ROM basic input-output system (BIOS) calls, looking for virus-like actions.