Determine whether the following function is continuous at a. Use the continuity checklist to justify your answer. f (x) = 1x - 5; a=4 Select all that apply. A. The function is continuous at a = 4. [ B. The function is not continuous at a = 4 because f(4) is undefined. C. The function is not continuous at a = 4 because lim f(x) does not exist. X -+ 4 [ D. The function is not continuous at a = 4 because lim f(x) # f(4). X -+ 4