Which EC2 pricing model is MOST cost-efficient to meet these requirements?

Explanations:

Spot Instances are the most cost-efficient option for short-term usage as they allow users to bid on unused EC2 capacity, often resulting in significant savings compared to other pricing models. However, they can be interrupted if the capacity is needed elsewhere.

On-Demand Instances offer flexibility and are billed by the hour or second, but they are more expensive than Spot Instances, making them less ideal for cost-efficient short-term usage.

Reserved Instances require a commitment to use EC2 for a one- or three-year term, offering lower rates in exchange for this commitment. They are not suitable for short-term needs.

Dedicated Hosts are physical servers dedicated to a single customer, which can be costly. This option is intended for specific compliance or licensing requirements rather than for cost-effective short-term usage.