Use the Rational Zero Theorem to list all possible rational zeros for the given function. f(x) =9x# - x3 + 4x-- 3x-21 . . . . . Which of the following is the complete list of possible zeros of the given function? O A. +1, +3, +7, 1- 3' OB. 1 7 + 1, +3, + 71+gitg OC. +1, +3, +7, +21, + 7+3. +9. #9 O D. The function has no rational zeros