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单项选择题You work as a database administrator for Certkiller .com. While granting a role，SELECT_CATALOG_ROLE， to a user， Certkiller， using Oracle Enterprise Manager 10g Database Control， you have cleared the DEFAULT check box. What will be the result？（）

A、The user cannot use the role at all.

B、The role would not be granted to the user.

C、The user needs to enable the role explicitly.

D、The user can start using the role immediately.

E、The user would have the admin option for the role.

  • C

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