Hackers create a botnet by: A. causing other people's computers to become "zombie" PCs following a master computer. B. using Web search bots to infect other computers. C. infecting corporate servers with "zombie" Trojan horses that allow undetected access through a back door. D. infecting Web search bots with malware.

The correct option to the following question is A.) causing other people's computers to become "zombie" PCs following a master computer.

Explanation:

Botnet is the network of an infected computer systems which are under the commands of the individual master system they work together to accomplishing the goal. Almost it is not harmful but as a paragraph above an attests, it is the powerhouse which behinds some of worst attack which hackers can attempts.

Botnet can rely only on the two things: the first one is the needs of the large networks of an infected device which are known as zombies.

The second one is the need of someone who commands them because without command they do nothing, frequently known as the Control center and Command, or the bot herder.