Elasticity is the correct option because it allows AWS to scale compute capacity up and down automatically so the environment grows during month end spikes and shrinks during normal use to avoid paying for idle resources.

Elasticity is implemented with services such as Amazon EC2 Auto Scaling and AWS Auto Scaling which add instances or containers when demand rises and remove them when demand falls. This dynamic scaling aligns consumed capacity with actual workload and directly addresses low average utilization by reducing baseline provisioned resources.

Global reach refers to deploying resources across multiple Regions to improve latency or meet compliance requirements and it does not target cost reduction from unused capacity.

Fault tolerance is about keeping systems running through component failures by adding redundancy and it does not change how much capacity is provisioned versus used.

High availability focuses on redundancy and uptime which can increase baseline capacity for resilience rather than eliminate idle resources.

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