Which pillar of the AWS Well-Architected Framework focuses on the return on investment of moving into the AWS Cloud?

Explanations:

The Sustainability pillar focuses on minimizing the environmental impacts of cloud operations and ensuring efficient resource usage, not directly on ROI.

The Cost Optimization pillar is dedicated to maximizing the value of cloud investments by managing costs and optimizing spending, directly relating to ROI.

The Operational Excellence pillar emphasizes running and monitoring systems to deliver business value and continuously improving processes, not ROI.

The Reliability pillar is centered around ensuring a workload performs its intended function correctly and consistently, not on financial return.