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Explain why the function is discontinuous at the given number a. (Select all that apply.) f ( x ) = x+ 4 ifx5-1 2X if x > - 1 a = -1 lim f(x) does not exist. x - -1 f(-1) is undefined. Of(-1) and lim f(x) are finite, but are not equal. x - -1 lim f(x) and lim f(x) are finite, but are not equal. x - - 1+ x - - 17 none of the above