Define Distributed Denial of Service Attack

A$)$ A group of computers being harnessed together by a hacker to flood the target with traffic.

B$)$ Hackers being able to exploit vulnerabilities in applications to insert malicious codes. C$)$ This occurs due to compromised credentials, but the range of other common causes include software mis$-$configuration, lost hardware, or malware.

D$)$ Taking someone$$s personal information to falsely obtain funds or other advantages.