Which two statements are true regarding roles?

Which two statements are true regarding roles? (Choose two.)

A.
A role can be granted to itself.

B.
A role can be granted to PUBLIC.

C.
A user can be granted only one role at any point of time.

D.
The REVOKE command can be used to remove privileges but not roles from other users.

E.
Roles are named groups of related privileges that can be granted to users or other roles.