hard20 pts · first answer countsmessage-queuesidempotencybackground-jobs

Welcome email sent twice

A worker sends the welcome email, then crashes before acknowledging the queue message. The message is redelivered and the user gets two emails. What is the right approach?

A.Switch to a queue product that guarantees exactly-once delivery, so a crashed worker can never cause a duplicateB.Make the consumer idempotent, e.g. store processed job IDs under a unique constraint and skip repeatsC.Acknowledge the message before doing any workD.Add a sleep before sending so the crash is less likely

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