Which statement is correct about interior gateway protocols?

A. IGPs require a small number of resources, such as CPU and RAM.
B. IGPs function within an administrative domain.
C. An EGP is an example of an interior gateway protocol.
D. IGPs use autonomous system numbers (ASN) that have been assigned by ARIN.

B. Interior gateway protocols function within an administrative domain. This administrative domain is defined with a common autonomous system number or area ID.