Which statement best explains whether the table represents a linear or nonlinear function?
input (x) output (y)
0 1
1 2
2 4
3 16

a- it is a linear function because there is a constant rate of change in both the input and output values.
b- it is a nonlinear function because there is a constant rate of change is both the input and output values.
c- it is a linear function because the output values are increasing at different rates.
d- it is a nonlinear function because the output values are increasing at different rates.