单选题A system administrator needs to quickly migrate a machine from AIX 5.1 to AIX 5.2. The administrator will only be allowed enough downtime to reboot the machine. Which installation method should be used to accomplish this task？（）APerform a migration installation during the reboot process.BPerform an alternate disk installation and migration using NIM.CCopy the /usr directory from another 5.2 server to this server.DPerform an update_all install from 5.2 media to take effect on reboot.
单选题
A system administrator needs to quickly migrate a machine from AIX 5.1 to AIX 5.2. The administrator will only be allowed enough downtime to reboot the machine. Which installation method should be used to accomplish this task？（）
A
Perform a migration installation during the reboot process.
B
Perform an alternate disk installation and migration using NIM.
C
Copy the /usr directory from another 5.2 server to this server.
D
Perform an update_all install from 5.2 media to take effect on reboot.
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