Which of the following are design principles of the reliability pillar of the AWS Well-Architected Framework? (Select TWO.)

The AWS Well-Architected Framework's Reliability pillar focuses on the ability of a system to recover from failures and meet demand. The principle "Stop guessing capacity" involves monitoring demand and automating the addition or removal of resources to maintain optimal levels. "Make changes to infrastructure by using automation" (or Manage change in automation) ensures that changes are made consistently and can be tracked, reducing the risk of human error that could impact reliability.

A. "Perform operations as code" is a design principle of the Operational Excellence pillar, not the Reliability pillar.
C. Adopting serverless architecture is a recommended practice that can improve reliability, but it is not one of the five core design principles of the Reliability pillar.
D. Using build and deployment management systems is a practice that supports the "Manage change in automation" principle but is not the principle itself.

1. AWS Well-Architected Framework. (2023, July). AWS Whitepaper. Retrieved from https://docs.aws.amazon.com/wellarchitected/latest/framework/welcome.html. In the "Reliability Pillar" section, under "Design Principles," the whitepaper lists: "Test recovery procedures," "Automatically recover from failure," "Scale horizontally to increase aggregate workload availability," "Stop guessing capacity," and "Manage change in automation."

2. AWS Well-Architected Framework. (2023, July). AWS Whitepaper. Retrieved from https://docs.aws.amazon.com/wellarchitected/latest/framework/welcome.html. In the "Operational Excellence Pillar" section, under "Design Principles," the whitepaper lists "Perform operations as code."