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

How to make a magic mirror
Get a mirror.
The bigger the mirror is, the better. The big round wall mirrors are perfect!
Get a laptop.

I. A small, portable laptop gives you the flexibility for this trick. Get a microphone and a small remote control.; II. Go to any website you can think of, and type' magic mirror' without the quotation marks, if it doesn't text) into a virtual computer. When you are using a laptop, remove all the cover tools and batteries.; III. This can be a lot of fun and will hopefully keep you awake for hours. Make sure your laptop has both a and usb ports so your computer will use these to run everything.; IV. Have a plasma laptop sitting on the bottom counter so you can get fancy! Bring a cardboard tube the size of a piece of cardboard. Put some paste on it, like glue, and heat it up, which will set its shape.;
The answer is:
I.