How does cloud computing support rapid elasticity?

Cloud computing supports rapid elasticity by allowing automatic resource scaling based on demand. This means that resources such as processing power, storage, and network bandwidth can be dynamically adjusted to meet the current needs of users without requiring manual intervention.

In scenarios where demand spikes, like during high traffic events or peak usage times, cloud services can quickly allocate additional resources. Conversely, in periods of low demand, the services can scale back, thereby optimizing resource utilization and costs. This flexibility is a cornerstone of cloud computing, making it particularly advantageous for businesses that experience fluctuating workloads.

Other options suggest limitations or manual processes that do not align with the core functionality of cloud services, which is to provide immediate and automated adjustments to resource allocation, reinforcing why the correct answer emphasizes automatic scaling.