A server will not boot and the administrator needs to run fsck on the filesystems to verify their integrity. Installation media and diagnostic media is unavailable and there is no NIM master defined in this environment. How would the administrator bring the system up to be able to run fsck on all the filesystems？（）

A.Boot from the IBM Disaster Recovery boot server thru the network.
B.Installation media or diagnostics media is required to acquire the rootvg.
C.Boot to maintenance mode， enter a limited function shell， and execute getrootfs hdisk0.
D.Hold space bar at boot time to automatically initiate a limited function shell， then enter getrootfs hdisk0.