Given the function definitions below, determine which can be used as cumulative distribution functions (CDFs) and which cannot. Justify your answers.

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a. F(c) = b. F(c) = ec 1 + ec { 0 for c (-,00) -x 2, for ce (1,00) otherwise C. F(c) = {1-(5)floor(c) for c>1 F(C, C2) = otherwise. where floor (c) = round down the value c. 1 if c and c (1,0) d. Io.1 (C)if c (1,00) (1.00) con (C)if c ()o() for c and (-0, 1) F(C, C2) = (1-e) (1 - e)Io.x) (C) [0.x) (C) e.