An online retailer wants to save money and is considering migrating to the public cloud so capacity can be added during the peak shopping season and automatically removed when the peak is over. Which of the following best describes this aspect of cloud computing?

Metered utilization refers to the billing model where cloud services charge based on the amount of resources consumed. While this can help manage costs, it does not inherently provide the automatic scaling capabilities that define rapid elasticity, which is the focus in the context of the retailer's needs.

Shared resources indicate that multiple users can access the same physical hardware and software resources within a cloud environment. Although this is a characteristic of cloud computing, it does not directly address the dynamic scaling of capacity in response to changing demand, which is the core aspect described in the question.

High availability refers to systems that are consistently operational and accessible, minimizing downtime. While important for e-commerce operations, it does not relate to the ability to scale resources dynamically as demand fluctuates. The focus here is on maintaining service continuity rather than adjusting capacity.