What Action Is Appropriate When Using an EMLA Cream Before

What action is appropriate when using an EMLA cream before intravenous catheter insertion?

A) Rub a liberal amount of cream into the skin thoroughly.
B) Cover the skin with a gauze dressing after applying the cream.
C) Leave the cream on the skin for 1 to 2 hours before the procedure.
D) Use the smallest amount of cream necessary to numb the skin surface.