This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to easily add references to wikipedia using proveit
Create an account on wikipedia and go to your user' preferences '
Select the' gadgets' tab.
This tab has different add-on features which are used to make editing work easier for users.
Check' proveit'.

Available choices:
[I] This will open a menu and displayed the driver for your word processor followed by the proveit function. Set your microsoft word database to any relevant address.;
[II] While not the most user friendly feature, it is one you will absolutely need to do. To do that, click' add profile ' Click on the' place-add bio' drop down button next to the cover photo Note that you can also click on the' place image' tab.;
[III] When you finish editing your pdf image, have a look at the page. There is a photo in the upper left part.;
[IV] This will enable a user script that makes it easy to find, edit, add, and cite references in wikipedia articles. Save settings through the button at the bottom of the preferences page.;
The answer is:
[IV]