What Describes the Basic Principles of Carbohydrate Counting to Plan

What describes the basic principles of carbohydrate counting to plan a diabetic diet?

A) The patient follows a set schedule of when to eat.
B) The patient can have most carbohydrates but must avoid artificial sweeteners.
C) The patient can eat when he wants but must only eat certain foods.
D) The patient has freedom to choose foods based on preference.
E) The patient must count carbohydrates but typically has few limits on fat and protein intake.