A nurse is providing teaching for a client who received a prescription for an epinephrine autoinjector to treat anaphylaxis. Which of the following Information should the nurse include in the teaching?

A. The epinephrine autoinjector should be administered into the outer thigh (vastus lateralis muscle), not the buttock or deltoid, for optimal absorption. B. Holding the autoinjector firmly in place for about 10 seconds ensures the full dose is delivered into the muscle, making this the correct teaching point. C. While shortness of breath can be a symptom of anaphylaxis, the autoinjector is typically used when multiple or severe symptoms occur. However, it may still be appropriate if respiratory symptoms are severe. D. The second autoinjector should only be used if symptoms persist or worsen after the first dose, not immediately after the first injection.