单项选择题

AsystemadministratorhasplacedanAIXbasemediaCD-ROMinaser……

A system administrator has placed an AIX base media CD-ROM in a server and initiated a reboot. The server has an ascii terminal attached to it. Which key or key combination must the administrator press to initiate the maintenance mode？（）

A.5
B.M
C.F8
D.Ctrl-Alt-Delete

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