Explain why the function is discontinuous at the given number a. (Select all that apply.) 1 f(x)=x+3 a = -3 lim f(x) does not exist. X-3 lim f(x) and lim f(x) are not finite, and are not equal. x-3+ x-3 f(-3) is undefined. f(-3) and lim f(x) are finite, but are not equal. X-3 Onone of the above Sketch the graph of the function. y 4 X