Sue wants to mail a glass vase. The bigger the box she uses, the more packing materials she will need to make sure the vase will not break

State which of the following sets of ordered pairs represent a function.set a: (5,2), (4,3), (3, 4), (2,5)set b: (-1, -6), (0, 2), (1, 2), (3, 6)set c: (2, 1), (4, 2), (2, 3), (8, 4)a. set cb. set bc. set ad. set a and set b.