Which of the following ClusterXL modes uses a non-unicast MAC address for the cluster IP address?

A. High Availability

B. Load Sharing Multicast

C. Load Sharing Pivot

D. Master/Backup

Explanation: ClusterXL uses the Multicast mechanism to associate the virtual cluster IP addresses with all cluster members. By binding these IP addresses to a Multicast MAC address, it ensures that all packets sent to the cluster, acting as a gateway, will reach all members in the cluster.

Reference: https://sc1.checkpoint.com/documents/R76/CP_R76_ClusterXL_AdminGuide/7292.htm