Which of the Following Is the Best Advice About the Question-And-Answer

Which of the following is the best advice about the question-and-answer period after an oral presentation?

A) Set a time limit for questions and answers.
B) Don't announce the question-and-answer period until the end of your presentation.
C) Don't repeat each question when it is asked because doing so wastes valuable time.
D) When answering the audience's questions, be sure to defend your position.