Which of the following must be divisible by 2 if z is a positive integer? Options:	A) z^2*(z−5)	B) (z^2−2)	C) z(z+2)^3	D) (z−1)*z*(z+1)	E) z^2*(z−5)
option D) (z−1)*z*(z+1) which represents the product of three consecutive integers   the product of 3 consecutive integers is divisible by both 2 and 3.   Answer is (z−1)*z*(z+1)
<result>D</result>
Which of the following must be divisible by 2 if z is a positive integer?