Which AWS benefit is demonstrated by on-demand technology services that enable companies to replace upfront fixed expenses with variable expenses?

Explanations:

High availability refers to the reliability and uptime of systems, not pricing models or cost structure.

Economies of scale refers to cost advantages achieved as the scale of operations increases, not on-demand costs.

Pay-as-you-go pricing allows companies to incur costs based on usage, replacing upfront costs with variable ones.

Global reach refers to the ability to operate in multiple geographic locations, not cost structure or pricing.