The correct answer is Brain,A computer virus is a kind of malicious computer program, which when executed, replicates itself and inserts its own codeThe full meaning of the virus is Vital Information Resources Under Siege.The brain was a BOOT sector virus and was loaded onto the computer from an infected floppy disk when it was turned on without the user even knowing about it.The Pakistani Brain was a complex BOOT virus that was loaded onto the PC before the operating system was loaded.Additional InformationAIDS:?AIDS stands for acquired immunodeficiency syndrome. It is the final stage of infection with HIV. It happens when the body's immune system is badly damagedFriday:?The Friday the 13th virus is actually called The virus Jerusalem, and was first created in 1987 with one objective in mind.Sobig:?The Sobig Worm was a computer worm that infected millions of Internet-connected, Microsoft Windows computers in August 2003.