A nurse is reinforcing teaching with a client who has type 1 diabetes mellitus about preventing hypoglycemia during vigorous exercise. Which of the following instructions should the nurse include in the teaching?

"Eat a snack containing carbohydrates as needed while exercising."

"Exercise when your previously administered insulin is at its peak."

"Avoid drinking liquid forms of carbohydrates before exercising."

"Avoid exercising if your blood glucose is less than 100 mg/dL."