【单选题】
When arriving at the customers location， two different users describe the problem， and from their description it seems to be two separate problems. Which of the following is an appropriate step to take？（）
A、Ignore both of them and decide what the real problem is.
B、Set up a separate call for each problem.
C、Have them duplicate the problem at the device.
D、Ask a third person and see if the problem is the same thing.
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