A magazine reported that the cost per gigabyte of computer storage changed during a 6-year period as shown in the graph of a function. Which statement best describes the graph of the function?

A
The function is linear and it decreases continually as the value of x increases.

B
The function is non-linear and it decreases continually as the value of x increases.

C
The function is linear and it increases continually as the value of x increases.

D
The function is non-linear and it increases continually as the value of x increases.