Which two statements are true regarding roles?(1Z0-071答案及解析)

Which two statements are true regarding roles? (Choose two.)
哪2个选项关于角色的说法是正确的。
A.A role can be granted to itself.一个角色能自我赋权。(错误,不可以自我赋权)
B.A role can be granted to PUBLIC.一个角色可以赋权给公开。(正确)
C.A user can be granted only one role at any point of time.在任何时候一个用户只能属于一个用户组。(错误,用户可以属于多个组)
D.The REVOKE command can be used to remove privileges but not roles from other users.
REVOKE命令用于移除特权但是不能移除其他用户的角色。(错误,可以移除其他用户角色)
E.Roles are named groups of related privileges that can be granted to users or other roles.
角色是可授予用户或其他角色的相关特权的命名组。(正确)

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