Which of the following essential characteristics of a cloud allows customers to closely match resource consumption with demand?

Resource Pooling describes the multi-tenant model where provider resources serve multiple consumers dynamically, but it does not specifically address the ability to scale consumption in line with demand.

On-demand self-service allows consumers to provision resources unilaterally without human interaction, but it describes access method rather than the scaling behavior that matches consumption to demand.

Broad network access describes availability of services over the network via standard mechanisms, which is about connectivity, not dynamic scaling of resources.

Rapid elasticity allows capabilities to be elastically provisioned and released, in some cases automatically, to scale rapidly outward and inward commensurate with demand. This directly enables customers to match resource consumption with actual demand at any given time, making it the correct characteristic for this use case.

Measured service refers to metered billing and usage monitoring, not the ability to dynamically scale resources up or down to meet demand.