Which of the following are pillars of the AWS Well-Architected Framework? (Choose two.)

The AWS Well-Architected Framework is built around six pillars designed to help cloud architects build secure, high-performing, resilient, and efficient infrastructure for their applications. Two of these pillars are Reliability and Operational Excellence. Reliability focuses on ensuring a workload performs its intended function correctly and consistently, recovering from infrastructure or service disruptions, and dynamically acquiring computing resources to meet demand. Operational Excellence emphasizes running and monitoring systems to deliver business value and continuously improving processes and procedures. Availability and Scalability are important aspects of cloud architecture but are not standalone pillars in the Well-Architected Framework; rather, they are concepts often addressed within pillars like Reliability and Performance Efficiency. Responsive design is a web development concept, not a pillar of the AWS Well-Architected Framework.