B. Wrong: Stopping guessing about capacity is about matching resources to demand instead of forecasting it. It does not describe replacing upfront purchases with usage-based spending.
C. Wrong: Going global in minutes is about deploying applications in many Regions quickly, for latency and reach. It does not address up-front spending or costs that follow usage.
D. Wrong: Speed and agility is about provisioning resources quickly so projects move faster. It does not describe the shift from fixed purchases to usage-based costs.
Explanation
The benefit is trading fixed expense for variable expense. The start-up avoids large upfront purchases and pays for IT as it uses it, so costs follow usage. The other three are real cloud benefits, but each addresses speed, reach or capacity planning instead.
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