Explain why the function is discontinuous at the given number a. (Select all that apply.) f(x) = x2 − 5x x2 − 25 if x ≠ 5 1 if x = 5 a = 5 f(5) is defined and lim x→5 f(x) is finite, but they are not equal. f(5) is undefined. lim x→5 f(x) does not exist. lim x→5+ f(x) and lim x→5− f(x) are finite, but are not equal. none of the above