I think it’s the image quality.
The correct answer would be revenue budget approach. In this approach, a manager is asked to maximize the profit they get from the services and goods that are produced. Revenue budget is a forecast of the sales of a company. Managers would use certain model to maximize the amount of such.
It makes graphs look better if you need a curved line, if someone wants to point something out they dont have to actual draw on the persons graph they can just use the electronic version, if you need to shade something in that you cant do while its straight on the screen, there are lots of things that a pen can be used for.