Please choose the correct ending to complete the given sentence: Building sandcastles: . three young children , 2 girls and a boy ,

Ending1: are wearing floral colored leotards, and they're using an exercise equipment in a backyard demonstrating how to properly use the exercise machine. Ending2: are playing at a beach and piling sand onto a big pile as waves continue to go in and out. Ending3: bounce on water buoys suspended under the sky of a summer day with boats in the background. Ending4: are inside one of the christmas tree lights.

Answer format: ending1/ending2/ending3/ending4