Multi-select problem: How does the next paragraph end?

How to change windows 7 login background
Understand what you are going to change.
If you are unsure, press the windows + l key to lock your computer. Here you would see an image on the whole screen which is termed here as login background of windows 7.

Choose your answer from:
[I] This picture of the desktop window shows on the whole front side of the screen, after you right click on it. Press the ctrl and f keys simultaneously.;
[II] Another important thing to note here is that the windows 7 login background will be visible to all users of the computer. Hence, you will need admin rights to do the change.;
[III] It looks like a computer resting on its back but you have the choice if to " defragment " or " delete. " Defragment is the deletion button in windows 7.;
[IV] Select " restart and history device " from the menu bar. The screenshot is black and white, with a small contrast around the area it is highlighted.;
[II]