________ adds a special visual effect to an object on a slide

Which of the following does not describe an event where the user interacts with the GUI?

a) booting up a machine b) scrolling through a document c) closing a window d) clicking on a file

With __________ development, individuals and companies contribute their efforts in de- veloping, maintaining and evolving software in exchange for the right to use that soft- ware for their own purposes, typically at no charge.

Fill in the blank(s) with the appropriate word(s).