单项选择题

要防止有人通过向子虚乌有的卖主发送采购定单的方式进行舞弊，以下哪种控制程序效果最差？

A.要求所有物资都必须向得到授权的卖主采购，而且负责维护该清单的人不能同时负责发出采购定单。
B.要求只能根据实际生产情况，对已经批准的卖主支付货款。
C.要求出售给公司生产材料的所有主要卖主都与公司签署合同。
D.要求每个月的总采购额不得超过该月的采购总预算。
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