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

Which two statements about classful or classless routing protocol operations are true? (Choose two.)
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.

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