Please choose the correct ending to complete the given sentence: Holidays and Traditions: [header] How to bowl with reactive bowling balls [title] Insert your fingers into the ball. [step] If you're right-handed, slide the middle and ring fingers of your hand hand into the upper two finger holes. If you're left-handed, insert the fingers of your left hand.

Ending1: The finger holes should come to a stop right around the first knuckle. This grip will be most effective for bowling precise angles. Ending2: The sixth finger that's keeping the ball still is on the top. The hole diameter and length will depend on your bowling technique. Ending3: Thumb and forefinger of your right hand should slide into the upper left fingers of your right hand. Also slide your thumbs into the side holes of your ball. Ending4: [substeps] Push your index and middle fingers into the ball as if you're trying to make a fist, to a 45 degree angle. [title] Move your index finger into the ball.

Answer format: ending1/ending2/ending3/ending4