Pay-as-you-go Pricing Model

B.

Measured service is where cloud services are delivered and billed in a metered way, where the cloud customer only pays for those that they actually use, and for the duration of time that they use them.

The concept being described in this question is commonly known as "measured service," which is option B.

Measured service is a fundamental aspect of cloud computing that allows cloud customers to pay only for the resources and services they consume, and only for the duration that they use them. Essentially, it means that cloud providers charge customers based on their usage, rather than a fixed rate or contract.

Measured service is often implemented through the use of metering and monitoring tools that track a customer's usage of various cloud resources, such as storage, processing power, and network bandwidth. The data collected by these tools is then used to generate usage-based billing statements, which detail the exact amount of resources consumed by the customer and the associated costs.

One of the key benefits of measured service is that it allows cloud customers to more effectively manage their costs, as they only pay for what they use. This can be especially valuable for organizations with variable or unpredictable workloads, as it allows them to scale their usage up or down as needed, without incurring unnecessary costs.

In addition to providing cost savings, measured service can also help to improve the overall efficiency and sustainability of cloud computing. By encouraging customers to use resources more selectively, it can help to reduce waste and minimize the environmental impact of cloud computing.