Which of the following addresses are valid Class C network IDs? (Choose two answers)

(A) 195.0.0.0
(B) 22.22.3.0
(C) 222.0.0.0
(D) 191.255.255.0
(E) 127.0.0.0

A and C are the correct answers.

Class C networks have the first octet in the range of 192–223, inclusive, and their network IDs have a 0 in the last three octets.