Can you figure out which company has the honest employees?

A recent business school graduate was interviewing with three global corporations. She knows that the people in one of the corporations always tell the truth. The employees of another one of the three companies always lie. In the third company, half the people always lie and the other half always tell the truth. The employees of each company know all about the people in the other two, including whether or not they are truthful.

The graduate does not know which company is which, but would like to be able to identify each one. The interviews are set up so that the prospective employee can only ask questions that have a "yes" or "no" answer. What questions can be asked to reveal the honesty of the three companies?

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