17. The mapping shows a relationship between x and y. Which statement is 5 points true of the mapping? *
-1
3
3
5
A. y is not a function of x, since the y-value 3 corresponds to two different x-values.
B. y is a function of x, since the y-values do correspond to exactly one x-value.
C. is not a function of x, since the x-values do not correspond to exactly one y-value.
D. y is a function of x, since the x-values do correspond to exactly one y-value