What are the minimal configuration steps that are required to configure EIGRP HMAC-SHA2
authentication?

A.
classic router mode, interface XX, authentication mode hmac-sha-256 <password>

B.
named router mode, address-family statement, authentication mode hmac-sha-256
<password>

C.
named router mode, address-family statement, af-interface default, authentication mode hmacsha-256 <password>

D.
named router mode, address-family statement, authentication mode hmac-sha-256
<password>