單項選擇題

There are no boot system commands in a router configuration in NVRAM.What is the fall back sequence that router will use to find an ios during reload？（）

A.Flash，TFTPserver，ROM
B.Flash，NVRAM，ROM
C.ROM，NVRAM，TFTPserver
D.NVRAM，TFTPserver，ROM
E.TFTPserver，F(xiàn)lash，NVRAM

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