You need to create a workflow where Task B runs only if Task A is successful, and Task C should always run regardless of Task A or B's status. How would you define this dependency using Airflow?

The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations. It covers performance optimization strategies, common pitfalls to avoid, and real-world examples from companies like Dunnhumby. The answer also includes follow-up discussion points that interviewers commonly explore.