In a VPN-1NGX R65 ClusterXL Load Sharing configuration, which type of ARP related problem
sometimes forces the use of Unicast Mode (Pivot) configuration due to incompatibility on some
adjacent routers and switches?

A.
Multicast MAC address response to a RARP request

B.
MGCP MAC address response to a Multicast IP request

C.
Unicast MAC address response to a Multicast IP request

D.
Multicast MAC address response to a Unicast IP request