The address 200.0.0.0 is a Class ______ network ID.

(A) A
(B) B
(C) C
(D) D

C is the correct answer.

Description	Class A	Class B	Class C
First octet range	1 – 126	128 – 191	192 – 223
Valid network numbers	1.0.0.0 – 126.0.0.0	128.0.0.0 – 191.255.0.0	192.0.0.0 – 223.255.255.0
Default mask	255.0.0.0	255.255.0.0	255.255.255.0