What feature of cloud computing involves multi-tenant resource allocation?

The correct answer, resource pooling, refers to the cloud computing feature where a single physical resource is shared among multiple users or tenants. In this model, resources such as computing power, storage, and network bandwidth are pooled together to serve various clients, allowing for efficient utilization and cost-effectiveness.

This multi-tenant nature of resource allocation is what makes cloud computing scalable and flexible. It enables service providers to allocate and manage resources dynamically based on current demand, ensuring that users can access the required resources without needing separate physical hardware for each tenant. This concept is fundamental to the cloud model because it maximizes efficiency and minimizes costs for both providers and consumers, distinguishing it from traditional IT infrastructures where resources are typically dedicated to specific users or applications.

Other options do not involve this multi-tenant concept. Measured service relates to usage monitoring and billing; rapid elasticity denotes the ability to scale resources up or down quickly; and a private cloud refers to a dedicated infrastructure for a single organization, which does not have a multi-tenant aspect.