What is the difference between competence and credibility?

What is the difference between competence and credibility?

• A. Competence relates to trustworthiness; credibility relates to qualifications.
• B. Competence relates to cross-examination ability; credibility relates to demeanor.
• C. Competence relates to qualifications and lack of disqualifications; credibility relates to the trustworthiness of testimony.
• D. They are the same.

Answer: (C)