Which of the following Reserved Instance (RI) pricing models provides the highest average savings compared to On-Demand pricing?

A. One-year, No Upfront, Standard RI pricing

B. One-year, All Upfront, Convertible RI pricing

C. Three-year, All Upfront, Standard RI pricing

D. Three-year, No Upfront, Convertible RI pricing

Reference: https://aws.amazon.com/ec2/pricing/reserved-instances/pricing/