Consider the function f (a) = 4. Which of the following best describes the behavior of f (x) at x = 4. O f (ac) has an infinite discontinuity at x = 4. O f (a) is discontinuous at a = 4 because the limit does not exist there. O f (x) is continuous at x=4 because the limit exists and equals f (4) . Of (x) is continuous at x = 4 because the limit exists, even though f (4) does not exist . Of (x) is continuous at a = 4 and f (4) = 8