Answer: Elasticity

**Elasticity** is the correct answer because it refers to the AWS Cloud's ability to automatically scale computing resources up or down based on demand. This characteristic allows users to: - **Eliminate underutilized CPU capacity** by scaling down resources when they're not needed - Scale up resources during peak usage periods - Pay only for the resources actually consumed - Automatically adjust capacity to match workload requirements **Why other options are incorrect:** - **Agility**: Refers to the speed and ease of deploying resources, not capacity optimization - **Reliability**: Focuses on service availability and fault tolerance - **Durability**: Concerns data persistence and protection against data loss Elasticity is a core benefit of cloud computing that enables cost optimization by preventing over-provisioning and eliminating wasted resources.

Author: Ritesh Yadav