\fDetermine whether the following function is continuous at a. Use the continuity checklist to justify your answer. f(x) = x -6; a =2 Select all that apply. A. The function is continuous at a = 2. B. The function is not continuous at a = 2 because f(2) is undefined. C. The function is not continuous at a = 2 because lim f(x) does not exist. x-2 D. The function is not continuous at a = 2 because lim f(x) = f(2). x-2