Determine whether the following function is continuous at a. Use the continuity checklist to justify your answer. X - 1 if x * 1 f(x) = X - 1 ;a = 1 3 if x = 1 . . . Select all that apply. A. The function is continuous at a = 1. B. The function is not continuous at a = 1 because f(1) is undefined. C. The function is not continuous at a = 1 because lim f(x) does not exist. X-+ 1 D. The function is not continuous at a = 1 because lim f(x) # f(1). X- 1For what values of a and b is the following function continuous at every x? - 2 XS - 1 f(x) =