问题:
A . It can be used to allow the access privilege settings for users but not roles.
B . It can be used to allow the access privilege settings for users as well as roles.
C . It can be used to control the time interval for which the access privilege is available to a user.
D . It can be used to selectively restrict the access for each user in a database to different host computers.
E . It can be used to selectively restrict a user's access to different applications in a specific host computer.
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