单项选择题
The staff is not able to access a database server. The server has an ’Operating System not found’error and is set to boot from a fiber channel SAN. All other database servers are set to boot from the SAN and access the same switch and data as this database server. Which of the following is the MOST likely cause of the problem？（）
A.The SAN is offline
B.Fiber channel switch
C.Multiple failed drives in the SAN
D.HBA
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