Which two are true about common objects? (Choose two.)
A.They can be created only in CDB$ROOT. B.They can be only metadata-linked in an application container. C.They can exist in user-defined schemas only in application containers. D.They can exist in CDB$ROOT and an application root. E.They can be extended data-linked in CDB$ROOT. F.They can be created only in an application root.正确答案DE
