What is the term used for describing when an attacker, through a command and control network, controls hundreds, thousands, or even tens of thousands of computers and instructs all of these computers to perform actions all at once?

A.
Flooding

B.
Spamming

C.
Phishing

D.
Botnets

Explanation:
D is the correct answer because the term used to describe this is a botnet.

Incorrect Answers and Explanations: A, B, and C: A is incorrect because flooding is an incorrect term for this case. B is incorrect because spamming is sending unsolicited email. C is incorrect because phishing describes a different concept. Phishing may use botnets as part of the attack, but phishing is different.