An Intrusion Detection System (IDS) is generating alarms that a user account has over 100 failed
login attempts per minute. A sniffer is placed on the network, and a variety of passwords for that
user are noted. Which of the following is MOST likely occurring?

A.
A dictionary attack

B.
A Denial of Service (DoS) attack

C.
A spoofing attack

D.
A backdoor installation