For a Client with Diabetes Mellitus Scheduled for Surgery at 8

For a client with diabetes mellitus scheduled for surgery at 8 AM, the nurse would plan to check the client's blood glucose level on the day of surgery between

A) 12 midnight and 2 AM.
B) 2 and 4 AM.
C) 4 and 6 AM.
D) 7 and 8 AM.