The consumption-based model, also known as the pay-as-you-go model, is the correct answer because it allows customers to pay only for the cloud resources they have actually used, which aligns with the company’s goal of cost-efficiency based on actual usage. This model offers the flexibility to scale resources up or down based on demand, and the costs will be adjusted accordingly.

Fixed pricing models are incorrect because they involve paying a pre-defined amount regardless of the actual usage, which could lead to overpaying if the allocated resources are underutilized. Subscription-based pricing may offer a discount for committing to a certain level of usage, but it would not be based solely on actual consumption, and over-committing could also lead to unnecessary costs. Lifetime pricing is not a standard billing model for cloud services, as it does not reflect the iterative and scalable nature of cloud consumption.