Which of the following best illustrates the default subnet mask for a class A,B, and C Network?

 A.     0.0.0.0, 0.0.0.1, 0.0.1.1
 B.     255.255.255.0, 255.255.0.0, 255.0.0.0
 C.     255.0.0.0, 255.255.0.0, 255.255.255.0
 D.     255.255.0.0, 255.255.255.0, 255.255.255.255

Ans:  C