Which two statements are true? (Choose two.)
A.
A role cannot be assigned external authentication.
B.
A role can be granted to other roles.
C.
A role can contain both system and object privileges.
D.
The predefined resource role includes the unlimited_tablespace privilege.
E.
All roles are owned by the sys user.
F.
The predefined connect role is always automatically granted to all new users at the time of their creation.