Which expression correctly shows how to use the binomial theorem to determine the 4th term in the expansion of (2x y + y) ? 7! O M (2x y ) ( x)4 3!4! = 280x6 y7 7! O 3!4! (2x3 y) (v)3 ) = 560xty IM IM 7! O 3!4! (2x' y) () 3 = 560x12 y7 7! O 3!4! (2x3 y) ()4 ) = 280xy