The graph of a polynomial function has zeros of 3 (multiplicity 2) and -7 (multiplicity 1). Identify a function in standard form that could represent this function A) f(x)=x^2-4x-21

B) f(x)=x^3+x^2-33+63

C) f(x)=x^3-x^2-33x-63

D) f(x)= x^2+4x-21