Your job is to write a basic blurring algorithm for a video driver. The algorithm will do the following: it will go through all pixels on the screen and for each pixel, compute the average intensity value $($in red, green and blue separately$)$ of the pixel and its $8$ neighbors. $($At the edges of the screen, there are fewer neighbors for each pixel.$)$

Let's say the number of pixels on the screen is $n.$ Then what is the order of the number of arithmetic operations $($additions and divisions$)$ required?

The number is order of $n^4.$

The number is order of $n.$

The number is order of $n^3.$

The number is order of $n^2.$