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
Answer: C