1.) what is the domain of the following set? (-2,4), (0,3), (1,6), (-1,2)

a. (-2,-1,0,1)

b. (1,-2,1,6,3)

c. (-2,-1,0,1,2,3,6)

d. (4,3,6,-1,2)

e. (4,3,6,-1,-2)