Identify the adjective clause in this sentence: The giant German Shepherd's ears, which he raised and lowered based on his interest in the scenery or visitors at a given moment, were his owner's favorite thing about him?
1) The giant German Shepherd's ears
2) which he raised and lowered based on his interest in the scenery or visitors at a given moment
3) were his owner's favorite thing about him.
4) based on his interest in the scenery
