What are the basic rules for eye contact during Q&A?

A、 Make eye contact when the person begins asking you question and move closer to that person without breaking the eye contact.
B、 Don't interrupt someone who is asking you a question.
C、 Smile with your eyes and mouth. This will show the person that you really care about what he or she is saying.
D、 When answering the question, you turn your body back to the audience and read the text on the slide.