Which two statements about classful or classless routing protocol operations are true?

A.	Classful routing protocols do not send subnet mask information with theirrouting updates.
B.	Variable-length subnet masks are supported when using classful routing protocols.
C.	Examples of classless routing protocols include RIPv1, EIGRP, OSPF, andIS-IS.
D.	Classful routing protocols do not support discontiguous subnets.