What kinds of ways the Oracle RAC's LoadBalance support?

What kinds of ways the Oracle RAC’s LoadBalance support?

LoadBalance is the basic function on the cluster software, it is to distribute the load averagely to each node in the cluster, thereby increasing the overall throughput.

What kinds of ways the Oracle RAC’s LoadBalance support? (Multiple Choice)
A . Clients balanced
B . Cluster nodes balanced
C . Service layer balance
D . Examples load

Answer: ABC