Final answer:
If you have a short term workload which needs the cheapest EC2 pricing but can't tolerate interruption, the billing model you should pick is Reserved.
Step-by-step explanation:
If you have a short term workload which needs the cheapest EC2 pricing but can't tolerate interruption, the billing model you should pick is Reserved. Reserved Instances allow you to reserve capacity for a specified period of time and provide a significant discount compared to on-demand instances. They offer a reliable and cost-effective option for workloads with predictable usage patterns and steady-state workloads.
While Spot Instances provide the cheapest pricing, they can be interrupted with a short notice if the Spot price surpasses your maximum bid. On-demand instances offer flexibility but may not be the most cost-effective option for long-term workloads.