Answer: On-Demand Instances

## Explanation **On-Demand Instances** are the most cost-effective choice for this scenario because: - **Short-term usage**: The company only needs the instances for 1 month, which is too short for Reserved Instances (which typically require 1-3 year commitments) - **Continuous operation**: The instances must run without interruption, which makes Spot Instances unsuitable (they can be terminated when AWS needs capacity) - **No long-term commitment**: On-Demand instances don't require upfront payments or long-term contracts - **Cost-effectiveness**: For short-term, continuous workloads, On-Demand provides the best balance of reliability and cost without the overhead of Reserved Instances **Why other options are less suitable:** - **Dedicated Hosts**: More expensive and typically used for compliance requirements or software licensing - **Reserved Instances**: Require 1-3 year commitments, which is unnecessary for a 1-month project - **Spot Instances**: Can be interrupted, which violates the requirement for continuous operation without interruption The interface correctly highlights "On-Demand Instances" as the selected answer based on the scenario of short-term, continuous usage with no long-term commitment.

Author: Ritesh Yadav