Q. What is the harmful program which reside inside a useful program and doesn’t replicate itself?

A
WORM
B
Trojan Horse
C
Ransomware
D
Logic Bomb
Solution:

The harmful program which reside inside a useful program and doesn’t replicate itself is called Trojan Horse.
A computer worm is a standalone malware computer program that replicates itself in order to spread to other computers.
Ransomware: a type of malicious software designed to block access to a computer system until a sum of money is paid.
Logical Bomb: a set of instructions secretly incorporated into a program so that if a particular condition is satisfied they will be carried out, usually with harmful effects.

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