How can AWS enable a company to control expenses as an application’s usage changes unpredictably?

How can AWS enable a company to control expenses as an application’s usage changes unpredictably?
A . AWS will refund the cost difference if a customer moves to larger servers.
B . The application can be built to scale up or down automatically as resources are needed
C . Spot instances will automatically be used if the price is lower than on-demand instances.
D . Amazon CloudWatch will automatically predict what resources are needed.

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Answer: B