Which of the following describes a Class A IP address?
A. The last octet is between 1 and 128 with a subnet mask of 255.0.0.0
B. The first octet is between 1 and 128 with a subnet mask of 255.255.255.0
C. The first octet is between 1 and 128 with a subnet mask of 255.0.0.0
D. The last octet is between 1 and 128 with a subnet mask of 255.255.255.0