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?

A. "Eat a snack containing carbohydrates as needed while exercising.": Consuming carbohydrates before or during vigorous exercise helps maintain blood glucose levels and prevents hypoglycemia. The amount and timing depend on the intensity and duration of activity, as well as current glucose levels. B. "Exercise when your previously administered insulin is at its peak.": Exercising during peak insulin action increases the risk of hypoglycemia because circulating insulin is highest. Clients are advised to schedule exercise when insulin activity is lower or adjust carbohydrate intake accordingly. C. "Avoid drinking liquid forms of carbohydrates before exercising.": Liquid carbohydrates, such as juice or sports drinks, are rapidly absorbed and can be used effectively to prevent hypoglycemia. Avoiding them is unnecessary and may increase the risk of low blood glucose. D. "Avoid exercising if your blood glucose is less than 100 mg/dL.": Exercise may be safely performed with glucose slightly below 100 mg/dL if the client consumes a carbohydrate snack beforehand. Blanket avoidance is overly restrictive and not consistent with current guidelines for safe exercise management.