The correct answer isDbecause the application runs onAWS Fargate On-Demand capacity, cannot tolerate interruptions, and the company wants tooptimize costswhile keeping the application operational. ACompute Savings Planis designed to reduce costs for consistent compute usage across AWS services, includingAWS Fargate, without requiring changes to the application architecture or using interruptible capacity.

A Savings Plan provides discounted pricing in exchange for a usage commitment over a period of time. This is ideal for workloads that must continue running without interruption because the application can remain onFargate On-Demand, which avoids the termination risk associated with Spot capacity. The company gets cost savings while preserving the reliability characteristics of the current deployment model.

Option A is incorrect becauseOn-Demand Capacity Reservationsare used to reserve EC2 capacity in a specific Availability Zone and do not apply as the main cost optimization mechanism for Fargate tasks. Option B is incorrect becauseConvertible Reserved Instancesapply to Amazon EC2, not Fargate. Option C is incorrect becauseFargate Spotcan be interrupted and therefore does not meet the requirement that the application cannot tolerate sudden interruptions.

AWS cost optimization guidance recommends selecting discount models that align with workload needs. For predictable, steady serverless container usage on Fargate that must remain highly available,Compute Savings Plansoffer the best balance of lower cost and uninterrupted operation. Therefore, purchasing aCompute Savings Planis the most appropriate solution.