What type of attack was the Stuxnet virus?

What type of attack was the Stuxnet virus?
A . cyber warfare
B . hacktivism
C . botnet
D . social engineering

Answer: A

Explanation:

Stuxnet is a computer worm that targets industrial control systems that are used to monitor and control large scale industrial facilities like power plants, dams, waste processing systems and similar operations. It allows the attackers to take control of these systems without the operators knowing. This is the first attack we’ve seen that allows hackers to manipulate real-world equipment, which makes it very dangerous.

Source: https://us.norton.com/stuxnet