The Nurse Is Reviewing Orders for a Newly Admitted Client

The nurse is reviewing orders for a newly admitted client with a student.Which statement by the student indicates that the student understands the meaning of a standing order?

A) It is to be given only once and at a specific time.
B) It is written in advance of a situation,and should be carried out under specific circumstances.
C) It is usually carried out within two hours of the time the order is written by the physician,but the exact timing is defined by each facility.
D) It is administered as required by the patient's condition.