Which EC2 instance purchasing option meets this requirement with the LARGEST discount compared to On-Demand prices?

Explanations:

Spot Instances are the most cost-effective option for workloads that can tolerate interruptions, offering discounts of up to 90% compared to On-Demand prices. They allow users to bid on spare EC2 capacity, making them ideal for flexible workloads.

Convertible Reserved Instances provide significant savings compared to On-Demand prices (up to 54%), but they require a commitment to a specific instance type for a term (1 or 3 years) and do not offer the largest discounts like Spot Instances do.

Standard Reserved Instances also offer considerable savings (up to 75%) but require a long-term commitment (1 or 3 years). While cheaper than On-Demand pricing, they do not match the discounts available through Spot Instances.

Dedicated Hosts are primarily aimed at physical server compliance and do not provide discounts comparable to Spot Instances. They are billed based on the host rather than individual instances, making them the least cost-effective for interruptible workloads.