A company plans to move from an on-premises data center to Azure. The CTO wants to avoid large upfront capital spending and instead pay monthly based on resource use. Which cloud benefit does this best describe?

The correct answer is Pay-as-you-go. This cloud benefit directly addresses the CTO's desire to avoid large upfront capital spending and instead pay monthly based on resource usage. It converts what would traditionally be a capital expenditure (CapEx) into an operational expenditure (OpEx). High availability refers to the ability of a system to remain operational even if some components fail, which is a cloud benefit but doesn't specifically address the cost model. Capital expenditure (CapEx) is the opposite of what the CTO wants; it represents large upfront investments in physical assets. Geo-distribution refers to deploying resources across multiple geographical regions for improved performance and disaster recovery, which is also a cloud benefit but not related to the payment model described.