Explain why the function is discontinuous at the given number a. (Select all that apply.) 2x2 - 7x - 4 A ( x ) = x - 4 if x # 4 a = 4 if x = 4 lim f(x) and lim f(x) are finite, but are not equal. x-4 x-4 f(4) is undefined. lim f(x) does not exist. f(4) and lim f(x) are finite, but are not equal. none of the above X Sketch the graph of the function. 12 10 10 8 6 4 2 6 8 10 12 2 6 8 10 AC 12 12+ 10 o 8 6 4 6 8 10 12 2 6 8 10 12 DX