Which two statements about OSPF authentication are true?

Which two statements about OSPF authentication are true? (Choose two.)
A. OSPF authentication is required in area 0.
B. There are three types of OSPF authentication.
C. In MD5 authentication, the password is encrypted when it is sent.
D. Null authentication includes the password in clear-text.
E. Type-3 authentication is a clear-text password authentication.
F. In MD5 authentication, the password never goes across the network.

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