A Patient Has Orders for 10 Units of Glargine (Lantus)

A patient has orders for 10 units of glargine (Lantus) insulin and 5 units of regular insulin to be given at the same time.Which action by the nurse is appropriate?

A) Injecting 10 units of air into the glargine insulin vial first and not withdrawing the medication
B) Injecting 5 units of air into the regular insulin vial first and then 10 units of air into the glargine insulin vial
C) Giving two separate injections using different needles and syringes
D) Withdrawing 5 units of regular insulin first and then calculating the total dose of regular and glargine insulin combined