单选题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.
单选题
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.
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