With GETVPN, if a key server is configured to use multicast as the rekey transport mechanism, then under which of these conditions will the key server retransmit the rekey message?
A.
It never retransmits the rekey message.
B.
It only retransmits the rekey message when it does not receive the rekey acknowledgement from at least one group member.
C.
It only retransmits the rekey message when it does not receive the rekey acknowledgement from all group members.
D.
It only retransmits the rekey message when DPD to the group member fails.
E.
It always retransmits the rekey message.