When purchasing services on the Huawei Cloud platform, billing issues are often involved. Huawei Cloud’s billing models generally include on-demand billing, monthly/annual package, and competitive bidding. Which of the following descriptions of the billing model is correct?

When purchasing services on the Huawei Cloud platform, billing issues are often involved. Huawei Cloud’s billing models generally include on-demand billing, monthly/annual package, and competitive bidding. Which of the following descriptions of the billing model is correct?
A . Pay-as-you-go is a post-payment model that charges based on the actual duration or amount of service used.
B . Monthly/annual packages are post-paid models and are charged based on a fixed purchase cycle.
C . Monthly/annual packages are suitable for scenarios where service resources can be activated or deleted at any time.
D . Bidding is a prepaid model. Compared with on-demand billing, it can be charged according to actual usage time with a lower discount.

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Answer: A