After taking glipizide (Glucotrol) for 9 months, a client experiences secondary failure. Which of the following would the nurse expect the physician to do
A．Initiate insulin therapy.
B．Switch the client to a different oral antidiabetic agent.
C．Prescribe an additional oral antidiabetic agent.
D．Restrict carbohydrate intake to less than 30% of the total caloric intake.
