Which AWS Well-Architected Framework pillar represents these requirements?

Explanations:

The Reliability pillar focuses on ensuring a workload can recover from failures and meet customer demand, which does not directly address reducing management overhead or improving processes.

The Operational Excellence pillar emphasizes running workloads effectively, improving processes, and reducing management overhead, making it the most suitable choice for the stated requirements.

The Performance Efficiency pillar is concerned with the efficient use of resources to meet system requirements and improve performance as demand changes, rather than focusing on management and processes.

The Cost Optimization pillar is centered on avoiding unnecessary costs and optimizing expenditures, which does not specifically relate to reducing management overhead or enhancing processes.