Let f be defined as follows, where a = 0, f (x ) = Jx -2axtaz , if x a x - a 5, if x = a Which of the following are true about f? I. lim f(x) exists. II. f(a) exists. III. f(x) is continuous at x = a O A. None. O B. I, II, and Ill. O C. I only. O D. II only. O E. I and ll only