Please choose the correct ending to complete the given sentence: Building sandcastles: A girl in a bathing suit is sitting on the beach. she

Ending1: is laying down on the ground picking up sand. Ending2: begins doing sit ups on the beach. Ending3: is holding the camera while treading water. Ending4: is putting sand into a cup and building a sand castle.

Answer format: ending1/ending2/ending3/ending4