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

How to make a pringles can macro diffuser
Get your pringles can.
If you want to use other chip brands that come in a can, just make sure it is reflective inside and fairly similar to the pringles version.
Be sure to clean out your can first.

Pick from:
[a]. It's worth sharpening your can so you have a quick clean up later. Set up the diffuser in an upright position.
[b]. It is recommended that you rinse out your can by pouring the black root extract over it. It is said in the practice section of this article for removing bits of " oil soak " from aluminum cans.
[c]. Be sure to clean all the plastic parts and rinse the can out with running water and paper towels. Be sure to vacuum outside the can as well to remove dust, dirt, and other small particles from the inside.
[d]. The chips won't do anything for your camera hardware. Take your flash that you will be using and estimate the size of hole you will need for it.
The answer is:
[d].