We can infer here that two statements that could potentially be considered defamation (libel or slander) are:
C. Frank cheated on the exam.
D. Frank is a murderer.
Defamation actually refers to the way one's reputation is damaged or destroyed by another person or by some set of people. It is also known as libel or slander.
We see that saying that Frank is a murderer or cheated in the exam is actually defamatory. It's damaging Frank's reputation and character. Thus, options C and D are correct answers.
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