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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 their routing updates.B. Variable-length subnet masks are supported when using classful routing protocols.C. Examples of classless routing protocols include RIPv1, EIGRP, OSPF, and IS-IS.D. Classful routing protocols do not support discontiguous subnets.

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