The nurse is preparing to administer ten units of regular insulin and twenty units of NPH insulin. Which of the following actions is correct when mixing the insulins?

a) Draw up the regular insulin first, followed by the NPH insulin, using separate syringes for each.
b) Draw up the NPH insulin first, followed by the regular insulin, using separate syringes for each.
c) Draw up the regular insulin first, followed by the NPH insulin, using the same syringe.
d) Draw up the NPH insulin first, followed by the regular insulin, using the same syringe.