Plaintiff sued Defendant for personal injuries arising out of an automobile accident. Which of the following would be ERROR?
The judge allows Defendant's attorney to ask Defendant questions on crossexamination that go well beyond the scope of direct examination by Plaintiff, who has been called as an adverse witness.  The judge refuses to allow Defendant's attorney to cross-examine Defendant by leading questions. The judge allows cross-examination about the credibility of a witness even though no question relating to credibility has been asked on direct examination. The judge, despite Defendant's request for exclusion of witnesses, allows Plaintiff's eyewitness to remain in the courtroom after testifying, even though the eyewitness is expected to be recalled for further cross-examination.
Question: Plaintiff sued Defendant for personal injuries arising out of an automobile accident. Which of the following would be ERROR?
A. The judge allows Defendant's attorney to ask Defendant questions on crossexamination that go well beyond the scope of direct examination by Plaintiff, who has been called as an adverse witness. 
B. The judge refuses to allow Defendant's attorney to cross-examine Defendant by leading questions.
C. The judge allows cross-examination about the credibility of a witness even though no question relating to credibility has been asked on direct examination.
D. The judge, despite Defendant's request for exclusion of witnesses, allows Plaintiff's eyewitness to remain in the courtroom after testifying, even though the eyewitness is expected to be recalled for further cross-examination.
Answer: