There are no boot system commands in a router configuration in NVRAM.What is the fallback sequencethat router will use to find an ios during reload？（）
- AFlash，TFTP server，ROM
- BFlash，NVRAM，ROM
- CROM，NVRAM，TFTP server
- DNVRAM，TFTP server，ROM
- ETFTP server，Flash，NVRAM