Which two are true about common objects? (Choose two.)

[answerhappygod]

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.