单项选择题

在审计某计算机服务合同时，审计师发现，虽然合同只要求承包商提供恰当水平的安全性，但承包商开发了所在行业最先进的安全程序。假设公司需要比较高的安全度，在评价公司是否向承包商支付了超出公司需要的电脑安全程序费用时，以下哪些潜在证据来源可能具有相关性？Ⅰ．将安全系统与类似系统所应用的最佳实务相比较；Ⅱ．将安全系统与近期刊物上有关该最先进系统相比较；Ⅲ．对安全系统的作用进行测试。

A.只有Ⅱ是对的。
B.只有Ⅲ是对的。
C.只有Ⅰ和Ⅱ是对的。
D.只有Ⅱ和Ⅲ是对的。
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