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

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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 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-I
E . Classful routing protocols do not support discontiguous subnets.

Answer: A,D

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