Each of the following is a clue that an interviewee is dishonest except:

a. Upon repeated accusations, a dishonest person’s denials become more vehement.
b. In order to add credibility to false statements, liars request that the interviewer obtain character testimony from other people.
c. Liars often refuse to implicate possible suspects—or, in other words, honest people are more willing to name others involved in misdeeds.
d. Dishonest people frequently cover their mouths with their hands or fingers during deception.