Determine which relation is a function. a. number graph ranging from negative four to four on the x and y axes. points are drawn on the graph at (negative four, three), (negative two, one), (negative one, three), (negative one, negative one), (one, one) and (two, negative one). b. number graph ranging from negative four to four on the x and y axes. points are drawn on the graph at (negative two, one), (negative two, negative two), (negative one, three), (zero, one), (two, zero) and (two, negative two). c. number graph ranging from negative four to four on the x and y axes. points are drawn on the graph at (negative two, one), (negative one, three), (zero, two), (zero, negative one), (one, three) and (two, one). d. number graph ranging from negative four to four on the x and y axes. points are drawn on the graph at (negative four, three), (negative three, negative one), (negative two, negative two), (negative one, zero), (two, zero) and (three, two).