Please choose the correct ending to complete the given sentence: Drum corps: . a marching group of cadets in dark clothing

Ending1: get into formation and march as a military salute in the middle of a large group of soldiers. Ending2: march down an open road with marching ducks on their uniforms. Ending3: comes into view in what appears to be a downtown city square. Ending4: are marching on one knee in a large square room.

Answer format: ending1/ending2/ending3/ending4