Which of the following pairs of statements is true in terms of configuring MD authentication?

A.
Interface statements (OSPF, EIGRP) must be configured; use of key chain in OSPF

B.
Router process (OSPF, EIGRP) must be configured; key chain in EIGRP

C.
Router process (only for OSPF) must be configured; key chain in EIGRP

D.
Router process (only for OSPF) must be configured; key chain in OSPF