Answer: Reliability, Operational excellence

The AWS Well-Architected Framework has five pillars: 1. **Operational Excellence** 2. **Security** 3. **Reliability** 4. **Performance Efficiency** 5. **Cost Optimization** From the given options: - **Reliability** is one of the five pillars - **Operational excellence** is one of the five pillars - Availability, Scalability, and Responsive design are not pillars of the framework but may be characteristics or benefits of well-architected systems The correct answers are Reliability and Operational excellence.

Author: Ritesh Yadav