Two musicians are comparing their trombones. the first produces a tone that is known to be 438 hz. when the two trombones play together they produce 6 beats every 2 seconds. which statement is true about the second trombone?

a. it is producing a 444-hz sound, and could be producing no other sound frequency.
b. it is producing either a 436-hz sound or a 440-hz sound.
c. it is producing either a 435-hz sound or a 441-hz sound.
d. it is producing either a 432-hz sound or a 444-hz sound.
e. it is producing a 441-hz sound, and could be producing no other sound frequency.