Nation-state threat actors often discover vulnerabilities and hold on to them until they want to launch a
sophisticated attack. The Stuxnet attack was an unprecedented style of attack because it used four types of
vulnerability.
What is this style of attack called?

A.
zero-day

B.
zero-hour

C.
zero-sum

D.
no-day

Explanation:
Stuxnet is a malicious computer worm believed to be a jointly built American-Israeli cyber weapon. Exploiting
four zero-day flaws, Stuxnet functions by targeting machines using the Microsoft Windows operating system
and networks, then seeking out Siemens Step7 software.
https://en.wikipedia.org/wiki/Stuxnet