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【单选题】
In your database instance， the user sessions are connected to the database server from the remote machines.You want to achieve the following for these users： 1. The user account must be locked after four unsuccessful login attempts. 2. The user must be prompted to change the password at regular intervals. 3. The user may not have more than three simultaneous sessions. 4. The user session must automatically be logged off if more than 10 minutes elapsed time used. How would you accomplish the above（）A.
By assigning profiles for the users
B.
By implementing Fine-Grained Auditing （FGA）
C.
By granting a secure application role to the users
D.
By implementing the Database Resource Manager plan
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【简答题】反馈控制系统属于 1 环控制;而前馈控制属于 2 环控制;实际应用中通常采用 3 结构.(提示:开/闭)
【简答题】反馈控制系统属于 1 环控制;而前馈控制属于 2 环控制;实际应用中通常采用 3 结构.
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