At what points is the following function continuous? X +27 x#3, x7 - 3 f(x) = x - 9 - 4.5, X=-3 4, x = 3 Choose the correct answer below and, if necessary, fill in the answer box to complete your choice. O A. Only at x = (Use a comma to separate answers as needed.) O B. All real numbers except at x = (Use a comma to separate answers as needed.) O C. All real numbers x