Please choose the correct ending to complete the given sentence: Walking the dog: A white dog is standing on the carpet. It has two casts on its front feet. it

Ending1: stands up on its back feet. Ending2: is walking around the room picking up objects off the floor. Ending3: stands on his hind legs and wipes its front paw. Ending4: begins to walk around the room licking the puppies.

Answer format: ending1/ending2/ending3/ending4