What Is the Nurse's Legal Duty with Regard to Implementing

What is the nurse's legal duty with regard to implementing a physician's order?

A) The nurse should follow the order unless the nurse believes some other course of action would be better.
B) The nurse should follow the order unless the nurse has reason to believe that the patient could come to harm if the order is followed.
C) The nurse should discuss each order with the physician, since physicians are only human.
D) The nurse should follow all orders as written.