Under the FRE Which of the Following Is Generally Not

Under the FRE which of the following is generally not a requirement for a person to be able to testify?

A) That the individual have personal knowledge of facts pertinent to the case.
B) That the individual have the ability to understand the obligation to tell the truth.
C) That the individual willingly take an oath (or affirm) that he or she will tell the truth.
D) That the individual possess mental qualifications in order to testify as a witness.