C is corrent because a bank lockbox system will result in collection of receivables by a bank, thereby eliminating employee contact with the cash. A is incorrect because while fidelity bonds do provide control, they are not generally as effective as a lockbox system since employees still handle cash. B is incorrect because a summary of checks received daily is unlikely to be as effective as a lockbox system. D is incorrect because independently prepared mailroom prelists are a less effective control than is a lockbox system--cash may still be misappropriated.
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