Which of the Following Quadratic Functions Have Zeros At $x=6$ And $x=-6$

Multiple Choice

Which of the following quadratic functions have zeros at $x=6$ and $x=-6$

A) $f(x) =(x-6) (x+6)$
B) $f(x) =5(x-6) (x-6)$
C) $f(x) =-9(x-6) (x+6)$
D) $f(x) =-(x+6) (x-6)$
E) $f(x) =8(x+6) (x+6)$