hard20 pts · first answer countsapi-testingconcurrencyapi-security

One coupon used twice

A coupon is valid for one use per user. A tester sends 10 identical redeem requests at the same moment and 3 succeed. What does this show?

A.The coupon limit was set to 3 by mistakeB.The client sent requests to different serversC.Normal behaviour for any API under loadD.A race condition: check-then-update is not atomic

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One coupon used twice

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