Which two are characteristics of leaf nodes in an Oracl…

Which two are characteristics of leaf nodes in an Oracle Clusterware 12c Flex Cluster? (Choose two.)

A.
They can be on a different subnet to the hub nodes.

B.
Grid Naming Service (GNS) must exist on one of the leaf nodes.

C.
They discover hub nodes automatically at startup.

D.
They require direct access to shared storage.

E.
They may discover hub nodes without having the DNS delegation configured by network.

F.
Oracle database 12c RAC instances may not run on leaf nodes.