Which two statements are true about the roles in the Oracle database？（） A:A role can be granted to itself. B:Roles are owned by the SYS user. C:Roles can be granted to other roles. D:A role cannot be assigned external authentication. E:A role can contain both system and object privileges.

Which two statements are true about the roles in the Oracle database？（）
A:A role can be granted to itself.
B:Roles are owned by the SYS user.
C:Roles can be granted to other roles.
D:A role cannot be assigned external authentication.
E:A role can contain both system and object privileges.

出自：Oracle认证

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