Which cloud computing characteristic allows consumers to expand or contract required resources automatically?

Rapid elasticity is the cloud computing characteristic that allows consumers to automatically expand or contract resources based on demand. Managing Cloud documentation explains that rapid elasticity enables scaling of computing resources in near real time.

This capability allows organizations to handle variable workloads efficiently without manual intervention. Resources can be provisioned when demand increases and released when demand decreases, optimizing performance and cost.

Measured service focuses on usage tracking, resource pooling shares infrastructure, and on-demand self-service enables user provisioning. Therefore, rapid elasticity is the correct answer.