Which of the following phrases describes a Botnet?

Which of the following phrases describes a Botnet?

A.
A large group of infected machines that drive a spread of a Bot to as many other machines as possible.

B.
The communications network (IP addresses and services) used by bots to communicate with their
criminal handlers.

C.
A collection of criminal servers that control Bots deployed on infected machines worldwide.

D.
The method by which a computer is compromised by a Bot. This includes, social engineering, malware,
malvertising, and bad links.