A company wants to rightsize its Amazon EC2 instances. Which configuration change will meet this requirement with the LEAST operational overhead?

Adding instances in another Availability Zone is a strategy for high availability and fault tolerance, not directly for rightsizing existing instances based on performance or cost.

Rightsizing involves analyzing utilization metrics (CPU, memory, network I/O) to determine if an instance is over-provisioned or under-provisioned and then selecting an instance type that better matches the workload requirements. Changing the instance size and type directly within the existing EC2 instance (e.g., stopping, changing type, starting) is a common and relatively low-overhead method to achieve this.

Converting the payment method to Savings Plans or Reserved Instances is a cost optimization strategy for pricing, not for adjusting the size or type of the instance to match workload performance needs.

While reprovisioning with a larger instance type might address under-provisioning, the question implies optimizing to rightsize, which could also mean smaller instance types. Simply reprovisioning with a larger type without analyzing utilization might lead to continued over-provisioning and higher costs.