Which statement is correct about interior gateway protocols (IGPs) vs. exterior gateway protocols (EGPs)?

A. Interior routing protocols are used to exchange information between autonomous systems.
B. Exterior routing protocols are used to exchange information between routers within an autonomous system.
C. Interior routing protocols are used to exchange information between routers within an autonomous system.
D. Exterior routing protocols are used in the core of an internal network.

C. Interior routing protocols are used internally inside of a network. The functional difference is that IGPs exchange information within an autonomous system, and EGPs exchange information between autonomous systems.