What are the three options available for Reserved Instances in AWS?

Reserved Instances in AWS provide a way for customers to reserve capacity and receive significant discounts compared to On-Demand instance pricing. There are three primary types of Reserved Instances that offer different levels of commitment and cost savings based on usage patterns:

1. Standard Reserved Instances (SURI) - These offer the most significant discounts and are suitable for steady-state workloads. A commitment is made for a one- or three-year term, and reservations can be more cost-effective for long-term, predictable workloads.

2. Convertible Reserved Instances (CURI) - These provide greater flexibility by allowing customers to change the instance attributes (instance type, OS, and tenancy) during the term of the reservation. Although the discounts are generally less than Standard Reserved Instances, they provide the benefit of adaptability as workloads change.

3. Scheduled Reserved Instances (SURI) - These are particularly useful for workloads that do not run continuously but are still predictable. Customers can reserve capacity for specific time periods, such as certain hours on specific days of the week.

The identified answer of PURI, NURI, and AURI correctly aligns with the terminology and structure of Reserved Instances in AWS, representing Standard, Convertible, and Scheduled types, respectively. Each type is tailored to various usage needs