Which of the following descriptions about purchasing and deleting Huawei Cloud bare metal servers is wrong?

Which of the following descriptions about purchasing and deleting Huawei Cloud bare metal servers is wrong?
A . Huawei Cloud Bare Metal Servers do not support on-demand purchases
B . Huawei Cloud Bare Metal Server charges include hard disk and elastic public IP fees
C . After purchasing the HUAWEI CLOUD Bare Metal service, you can only release resources by canceling the subscription
D . Huawei Cloud Bare Metal Server supports changing the operating system, and the price difference between different operating systems will be automatically deducted

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Answer: A