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

How to decorate a headboard
Clean the headboard to remove dirt and dust.
Use a microfiber cloth and soapy water to wipe down the headboard and get it ready for sanding. This is especially important if it was in a dirty or dusty area like an attic, basement, or storage space.

Choose from: i. Use a heavy-duty nail to permanently chip away all traces of paint. If you want to add security and texture on the headboard, sanding is necessary as it will help hold in the tightest corners and edges.; ii. Wet a microfiber cloth and wipe the bedding of all sides and the back of the headboard. Wipe down the base of the headboard, and vacuum under the bed.; iii. Dish detergent is normally gentle enough for washing most furniture, but if you're concerned about the material of the headboard, you use oil soap which is furniture safe. You can find oil soap at most craft stores.; iv. Sanding bumps the surface of the headboard more vigorously than sanding raises it, resulting in frags. Try leaving the headboard in the washing machine or dryer instead, to achieve a clean, smooth finish.;
The answer is:
iii.