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

Behavior blockers

Cyclical redundancy checkers (CRCs)


Active monitors

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.

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