Which statement about the operation of upgrading Huawei server iBMC firmware is incorrect?

Which statement about the operation of upgrading Huawei server iBMC firmware is incorrect?
A . The iBMC system has a primary and backup image, and each upgrade can only upgrade one image, so the iBMC firmware upgrade must be performed twice.
B. The primary system image is used for normal access to the iBMC interface. The iBMC firmware upgrade first upgrades the primary image.
C. After the backup image upgrade is completed, the iBMC system will restart, log out the currently logged-in users, and automatically switch the image file to the upgraded backup system image.
D. To ensure a successful upgrade, power interruption and restarting of the iBMC system are not allowed during the upgrade process.

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Answer: B