Please choose the correct ending to complete the given sentence: Disc dog: A man is on an open field with frisbees. He uses the frisbees to train a collie dog. the dog

Ending1: runs around behind the man and eats the frisbees. Ending2: gets down on all fours and begins frisking all over the field. Ending3: scratches his ear as he walks. Ending4: chases, grabs, and does tricks to get the frisbees.

Answer format: ending1/ending2/ending3/ending4