Which statement best explains whether the table represents a linear or nonlinear function?

input (x)
-2
-5
-8
-11

output (y)
7
4
1
-2

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 in both the input and output values.

c. it is a linear function because the input values are decreasing.

d. it is a nonlinear function because the input values are increasing.