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

How to apply decals
Choose a flat surface to put your decal on.
You can put your decal on a wall, glass window, painted wood, the outside of a vehicle, or another non-porous flat surface. Avoid porous surfaces made out of things like brick, cement, and leather, or your decal may not stick properly.

OPT:
* Avoid applying your decal in extreme temperatures. Put your decal on your chosen surface when it's between 50-90 f (10-32 c) outside or in the room you're applying it in.;
* Other flat surfaces, such as metal or fiberglass, can be tricky to view. However, many folks like to take their decal off of car or home objects before getting ready to put it on a flat surface.;
* Get a stencil that will cover the decal completely, like a dome-shaped, disc-shaped, or american eagle stencil. A good stencil will cover the entire background of your decal.;
* You can trace lines to prevent chipping. These can be traced later with a long pencil.;
The answer is:
Avoid applying your decal in extreme temperatures. Put your decal on your chosen surface when it's between 50-90 f (10-32 c) outside or in the room you're applying it in.