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A incomplete program , which is intentionally made for infecting other programs is known as computer virus.

Infection Methods:

(a) Append: In this method viral code appends itself to the unaffected program.

(b) Replace: In this method viral code replaces original executable program

completely or partially.

(c) Insert: In this method the viral code is inserted in the body of an executable code

to carry out some funny actions.

(d) Delete: In this case viral code deletes some codes from executable program.


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