Which statement is true regarding the removal of an instance from OracleAS Cluster?

Which statement is true regarding the removal of an instance from OracleAS Cluster?

A.
The instance can be removed only after the cluster is stopped.

B.
The instance should not be the only member available in the cluster.

C.
The instance must be shut down before removing it from the cluster.

D.
The instance must be functional while removing it from the cluster.

E.
The instance would be shutdown if it is up while removing. It needs to be manually restarted
after the removal.