The nurse has an order to administer a rectal suppository to a 3-month-old child. In addition to lubricating the suppository, which intervention will help assure appropriate administration of the medication?

Holding the buttocks tightly together for 1 to 2 minutes after insertion.

Pre-warming the suppository in the hand for 10 to 20 seconds.

Using the index finger to insert the suppository into the rectum.

Placing the child on the abdomen for insertion of the suppository.