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You issued the following command to mount the DATA disk group in restricted mode：   ALTER DISKGROUP data MOUNT RESTRICT；   What is the implication of this command？（）
A: The client RDBMS instance can access the file as a read-only file.
B: A new disk cannot be added to a disk group.
C: A disk in a disk group can be taken offline.
D: The client RDBMS instance cannot access the files in the disk group.

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出自：Oracle认证

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