The sum of the zeros, the product of the zeros, and the sum of the coefficients of the function f(x)=a x^{2}+b x+c are equal. Their common value must also be which of the following?
Answer Choices
A. the coefficient of x^{2}
B. the coefficient of x
C. the y-intercept of the graph of y=f(x)
D. one of the x-intercepts of the graph of y=f(x)
E. the mean of the x-intercepts of the graph of y=f(x)