Which is the best process for firmware upgrade of Huawei’s critical business server (KunLun Server)?

Which is the best process for firmware upgrade of Huawei’s critical business server (KunLun Server)?
A . Download software package -> Upgrade CMC software -> Upgrade system computing frame -> Upgrade management frame CPLD -> Upgrade cabinet LCD screen -> Upgrade RAID card -> Upgrade NIC
B. Download software package -> Upgrade system computing frame -> Upgrade CMC software -> Upgrade management frame CPLD -> Upgrade
C. Download software package -> Upgrade NIC -> Upgrade CMC software -> Upgrade system computing frame -> Upgrade management frame CPLD -> Upgrade cabinet LCD screen -> Upgrade RAID card
D. Download software package -> Upgrade CMC software -> Upgrade cabinet LCD screen -> Upgrade system computing frame -> Upgrade management frame CPLD -> Upgrade RAID card -> Upgrade NIC

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Answer: B