What does not reflect the features of cloud computing on-demand self-service in the following options are

What does not reflect the features of cloud computing on-demand self-service in the following options are
A . The engineer purchased a cloud server from Huawei public cloud according to his needs.
B . The engineer upgraded the cloud server CPU he purchased from 2 to 4
C . The engineer changed the operating system of the cloud server he purchased from Linux to Windows
D . The engineer received a notification message from the server provider one week before the cloud server expired.

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Answer: D