Cliff was working on a rig when he had a fall that caused a major head injury. His family sues his employer for negligence. As a medical doctor, Dr$.$ Royster specializes in traumatic brain injuries, and he is called to testify at the trial. Dr$.$ Royster will be allowed to

Only testify to the facts of the case if he was an eyewitness

Give his opinion related to Cliff's injuries if he is deemed an expert

None of these choices

Only testify to the facts of the case even if he was not an eyewitness to the accident