The correct answer is A. AIDS.
A computer virus is a malicious piece of code that can replicate itself and spread from one computer to another. It can damage files, steal data, or even take control of a computer.
AIDS is a disease that affects the immune system. It is caused by the human immunodeficiency virus (HIV). HIV attacks and destroys CD4 cells, which are a type of white blood cell that helps the body fight infection.
Anna Kournikova is a Russian tennis player. She is known for her beauty and her athletic ability.
Brain is a computer virus that was first discovered in 1986. It is one of the oldest and most well-known computer viruses. Brain infects floppy disks and can spread to other computers when the infected floppy disk is inserted into a computer.
Don is a common name for a man. It is not a computer virus.