Answer: Anticipate failure

The operational excellence pillar of the AWS Well-Architected Framework includes the design principle "Anticipate failure." This principle emphasizes designing systems that can withstand failures by implementing mechanisms such as: - **Automated recovery**: Building systems that can automatically detect and recover from failures - **Failure testing**: Regularly testing failure scenarios to ensure system resilience - **Graceful degradation**: Designing systems to continue operating with reduced functionality during failures - **Monitoring and alerting**: Implementing comprehensive monitoring to detect issues early The other options belong to different pillars: - "Create annotated documentation" relates to operational excellence but is not a core design principle - "Ensure performance efficiency" belongs to the performance efficiency pillar - "Optimize costs" belongs to the cost optimization pillar

Author: Ritesh Yadav