A company plans to migrate its legacy application to the AWS Cloud. One of the main challenges it faces is the occasional overload of the on-premises servers during unexpected spikes in demand, leading to interruptions in service. The company wants to ensure that the cloud-based solution can handle changes in load without human intervention. Which pillar of the AWS Well-Architected Framework should be emphasized to address this specific concern?
Security
Reliability
Performance Efficiency
Operational Excellence