Explain why the function is discontinuous at the given number a. (Select all that apply.) f(x) = {cos(x) if x < 0 0 if x = 0 1−x2 if x > 0 a = 0 limx→0+f(x) and limx→0−f(x) are finite, but are not equal. f(0) and limx→0 f(x) are finite, but are not equal. f(0) is undefined. limx→0 f(x) does not exist. none of the above Sketch the graph of the function.