Which two statements are true about the role of cluster master in whole server migration? (Choose two.) 

Answer options:

A. There is exactly one cluster master in the cluster at a given point of time.
B. The cluster master must host all the pinned services in the cluster.
C. Any managed server in the cluster can serve as the cluster master.
D. A cluster master must always be different from a singleton master.
E. The cluster master must always be started with the node manager.

AC

One server instance in a cluster that contains migratable servers acts as the cluster master and orchestrates the process of automatic server migration, in the event of failure. Any Managed Server in a cluster can serve as the cluster master, whether it hosts pinned services or not. Note: Any server instance in the cluster can serve as the cluster master. When you start a cluster that contains migratable servers, the first server to join the cluster becomes the cluster master and starts up the cluster manager service. If a cluster does not include at least one migratable server, it does not require a cluster master, and the cluster master service does not start up. Reference: https://docs.oracle.com/cd/E12839_01/web.1111/e13709/migration.htm#CLUST285