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Answer (A) is correct . Receiving departments are often eliminated with a JIT system so receiving reports are not needed. Also, the quantity received should be exactly equal to immediate production needs.

Answer (B) is incorrect because Voucher approval prior to paying accounts payable is a control that should not be affected by adoption of a JIT system.
Answer (C) is incorrect because Two signatures required on large checks is a control that should not be affected by adoption of a JIT system.
Answer (D) is incorrect because Locked doors on production areas is a control that should not be affected by adoption of a JIT system.