CompTIA Security+ Exam Prep

Answer: D - Opinion evidence involves testifying only on the facts as a witness. When a witness testifies, the opinion rule dictates that s/he must testify for only the facts of the issue and not opinion of the facts. This is slightly different from when an expert witness is used, because an expert is used primarily for an educated opinion. Most lawyers call in expert witnesses to testify and help the defending or prosecuting sides better understand the subject matter so they can help the judge and jury better understand the matters of the case.