A nurse is preparing to administer regular and NPH insulin to a client. Which of the following actions should the nurse take?

A. Withdraw the NPH insulin last: When mixing insulin, the regular (clear) insulin should be drawn into the syringe first, followed by the NPH (cloudy) insulin to avoid contaminating the regular insulin. B. Mix the medications in a 3-mL syringe: While mixing is correct, the syringe size is not specifically relevant unless the total dose exceeds the syringe capacity. A standard insulin syringe should be used. C. Administer the medications in two separate syringes: This is unnecessary when mixing regular and NPH insulin is appropriate. D. Inject air into the regular vial first: Air should be injected into the NPH vial first, then the regular vial.