Which is the correct DFC interface hierarchy?

A.
IDfSysObject extends IDfPersistentObject which extends IDfTypedObject.

B.
IDfSysObject extends IDfTypedObject which extends IDfPersistentObject.

C.
IDfFolder extends IDfCabinet which extends IDfSysobject.

D.
IDfPermit extends IDfACL which extends IDfSysobject.