How would you answer an interview scenario involving deferred execution in LINQ?

For an interview scenario involving deferred execution, I would first clarify the business goal, scale, constraints, and the failure or quality attribute the interviewer wants to explore. Many LINQ queries are evaluated only when enumerated rather than when the query expression is created. In this scenario, a query unexpectedly executes three times during one request. Explain how deferred execution could cause it. For production, materialize intentionally when a stable snapshot is required and avoid accidental multiple enumeration. I would then explain the main alternatives and tradeoffs, identify likely failure modes, and describe how I would validate the solution through testing, observability, security controls, and recovery or rollback planning.