题目内容

AUniversitycustomerhasaBladeCenterHfullypopulatedwithLS21Blades，asingleAMM，andfourpowermodules.TheBladeCenterhasbeenrunningflawlesslyforthreemonths.Onedayanadministratordiscoversthattheycannotviewvideoonblades9-12eitherlocallyorremotelyeventhoughtheystillappeartoberunning.Thevideoworksonalloftheotherblades.Whichofthefollowingisthecauseofthevideoproblem？（）

Apowermodulehasfailedandthereisnotenoughpowertoseevideoonallblades.
B. MUX3ontheBladeCenterbackplanehasfailed.
C. AfirmwareupdateisrequiredontheAMM.
D. AsecondAMMisrequiredtoviewvideoonblades9-14.

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