A 45-year-old patient who is overweight has had a diagnosis of type 2 diabetes for 2 years. The ...

A 45-year-old patient who is overweight has had a diagnosis of type 2 diabetes for 2 years. The patient uses 20 units of insulin per day. The patient's fasting blood glucose (FBG) is 190 mg/dL.
 
  The patient asks the nurse about using an oral antidiabetic agent. The nurse understands that oral antidiabetic agents
  a. cannot be used if the patient is overweight.
  b. cannot be used once a patient requires insulin.
  c. may be used since this patient meets criteria.
  d. may not be used since this patient's fasting blood glucose is too high.