The nurse cares for a client with a terminal disease who has an advance directive supporting a do not resuscitate (DNR) code status. The client stops breathing and loses a pulse. The client's adult child states, I changed my mind. Do whatever you can to save him! Which intervention is most appropriate at this time?

a) Begin CPR immediately
b) Respect the client's wishes
c) Call a code blue
d) Seek clarification from the healthcare provider