Select the correct statement about the function represented by the table.
7
2
21
63
189
567
a. it is a linear function because the y-values increase by an equal
difference over equal intervals of x-values.
b. it is an exponential function because the factor between each x- and y-value is constant.
c. it is an exponential function because the y-values increase by an equal factor over equal intervals of x-values.
d. it is a linear function because the difference between each x-and y-value is constant.