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单项选择题A system must be upgraded from AIX 5.1 to 5.2.  Which of the following scheduling processes should be performed? （）

A、 Schedule enough down time to backup, upgrade and reboot. 

B、 Backup, upgrade, then schedule enough down time to reboot the system. 

C、 Backup, then schedule enough down time to upgrade and reboot the system. 

D、 No scheduling processes are necessary because no down time is required.

  • A

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