Please choose the correct ending to complete the given sentence: Horseback riding: . a young woman in a black shirt and jean pants

Ending1: is standing and talking to the camera as instructors are standing to her side and she begins to position herself so she has the lynyrd skynyrd scarf wrapped around her ears. Ending2: welds something onto a bicycle in a laboratory environment. Ending3: is sitting on the back of a grey horse with a long grey mane in the middle of a large grassy field with hills behind them. Ending4: is standing and talking in a gym and hanging onto her phone with her friends as they walk around in the hallway.

Answer format: ending1/ending2/ending3/ending4