Which statement is true, as relates to classful or classless routing?

Which statement is true, as relates to classful or classless routing?
A. Automatic summarization at classful boundaries can cause problems on discontinuous subnets
B. EIGRP and OSPF are classful routing protocols and summarize routes by default
C. RIPv1 and OSPF are classless routing protocols
D. Classful routing protocols send the subnet mask in routing updates

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