Answer: Cost optimization

The AWS Well-Architected Framework has five pillars: 1. **Operational Excellence** 2. **Security** 3. **Reliability** 4. **Performance Efficiency** 5. **Cost Optimization** Among the options: - **Cost optimization** is one of the five pillars - Patch management is part of operational excellence - Business technology strategy is not a specific pillar - Physical and environmental controls are part of security considerations The correct answer is **Cost optimization** as it is one of the core pillars of the AWS Well-Architected Framework.

Author: Ritesh Yadav