题目：A company wants to develop a software system to manage order. Every day, the customers send the order information to the salesman by fax. And then, the salesman inputs the information into the system. Then, in this case, which should be the actor of the system in use case diagram?（） 一家公司想要开发一个软件系统来管理订单。每天，客户通过传真将订单信息发送给销售人员。然后，销售员将信息输入系统。那么，在这种情况下，本系统中下列哪个应该是用例图中的参与者？（）
A. Fax machine
B. Salesman
C. Order information
D. Customer
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