Which of the tables represents a function?

table a
input output
4 3
3 2
3 1
table b
input output
1 3
3 5
5 7
table c
input output
0 0
1 4
1 5
table d
input output
4 1
4 2
4 3

table a
table b
table c
table d

Which statement is true about the local minimum of the graphed function? over the interval[-4,-2], the local minimum is 0. over the interval [-2,-1] , the local minimum is 25. over the interval [-1,4], the local minimum is 0. over the interval [4,7], the local minimum is -7