Discussion
Assertion (A): Idempotency matters more in serverless than in a traditional request handler.
Reason (R): Event sources typically deliver at least once, so retries and duplicates are routine.
Answer: C
Both are true and the reason gives the cause, and the platform's own retry behaviour on failure adds to it. A handler that charges a card without a deduplication key will eventually charge it twice. Writing the deduplication key before doing the work is the usual guard against it.
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