Which two functions in the TLS protocol allow client/server applications to communicate?

Which two functions in the TLS protocol allow client/server applications to communicate?
(Choose two.)

A.
It uses a substitution cipher for encoding and a symmetric key for confidentiality.

B.
It prevents eavesdropping, tampering, and message forgery, and a PKI provides user
authentication.

C.
It supports NAT traversal at the protocol layer.

D.
It provides data-origin authentication instead of user-origin authentication.