The following are steps in an investigation into electrically charged objects.

Step #1: Blow up a balloon.
Step #2: Rub the balloon against your hair.
Step #3: Rub a plastic fork against your hair.
Step #4: Bring the two objects together and observe what happens.

Which steps are required to charge the objects?

Steps #1 and #2
Steps #2 and #3
Steps #3 and #4
Steps #1 and #4