Explain why the function is discontinuous at the given number a. (Select all that apply.) 1 X+5 a=5 f(x) = f(5) is undefined. lim f(x) and lim f(x) are not finite, and are not equal. x f(5) and lim f(x) are finite, but are not equal. XrS lim f(x) does not exist. X'5 none of the above