Using the intermediate value theorem, determine, if possible, whether the function f has at least one real zero between a and b f(x) =x +3x - 9x - 5; a = -8, b= -4 Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice O A. By the intermediate value theorem, the function does not have at least one real zero between a and b because f(@)= and f(b) = (Simplify your answers.) O B. By the intermediate value theorem, the function has at least one real zero between a and b because fa)= and f(b) = .. (Simplify your answers.) O C. It is impossible to use the intermediate value theorem in this case