Which two statements about Cisco ESA clusters are true? (Choose two.)
A. A cluster must contain exactly one group.
B. A cluster can contain multiple groups.
C. Clusters are implemented in a client/server relationship.
D. The cluster configuration must be managed by the cluster administrator.
E. The cluster configuration can be created and managed through either the GUI or the CLI.
i think is BD
that is right,
Cluster configuration options must be done via the CLI on the ESA and cannot be created or joined in the GUI.