Which of the following are pillars of the AWS Well-Architected Framework?

Explanations:

Availability is important but is covered under Reliability; it is not a standalone pillar.

Reliability is one of the core pillars, focusing on ensuring workloads recover from failures.

Scalability is essential but falls under Reliability and Performance Efficiency, not a pillar.

Responsive design is not part of AWS Well-Architected Framework; it’s a front-end design concept.

Operational excellence is a core pillar, focusing on running and monitoring systems effectively.