Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to break a rack in pool [title] Rack the balls. [step] Gather the balls and put them in the rack. Align the base of the rack so it is parallel to the back of the pool table.

Ending1: Put the eight ball in the center of the rack. Put a solid ball in one corner, and a striped ball in the other corner. Ending2: Stand the balls up and make a tally of how many balls to rack. Use a prop to help avoid tipping the balls as you rack them. Ending3: If you have 9 balls in your rack, push the balls so they can move in addition to their respective scores. If you don't have 9 balls in your rack, set up the table for them, placing the balls so they can move in sync with the overall score of your set. Ending4: Position the balls so they are scattered about at the corners of the pool table. [substeps] Set up the rack so the balls cannot get out of the rack on their own.

Answer format: ending1/ending2/ending3/ending4