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

How to change the color of your iphone
Decide if you are worried about placing a sticker on your iphone.
A sticker will wear over time, peeling back and leaving sticky residue. But, if you want a low cost color change, this is the best way to do it.

OPT:
(a). When you place a sticker on your iphone, you can easily remove it without having to touch it. However, stickers are delicate, so using sticker remover will loosen and peel it back if it flakes.;
(b). Research companies that sell skins on the internet. There are dozens, if not hundreds, of companies who provide sticker decals for your iphone.;
(c). Stickers will still peel off, and they may shrink, erasing everything you can get, so try getting them professionally removed from your iphone. Stickers can also be removed from flash-proof frames, but removable frames can rot in 10 , 15 , 25-30 days.;
(d). Stickers are purely a means to keep items from being perceived as junk by the seller. Stickers can be as cheap as 50 cents or as much as $500.;
The answer is:
(b).