Multi-select problem: How does the next paragraph end?

How to clean cork floors
Sweep regularly.
Use a soft-bristled broom, a dust mop, or a vacuum cleaner with a soft brush attachment. Depending on how heavily you use the area, repeat 2-7 times a week, or whenever you notice it getting dusty.

Pick from:
[a]. For example, if you have areas in which your floor may be recently dirty, sweep weekly. Cleaning floors routinely is another indicator of your attic being dusty.;
[b]. If you wait too long, grit and dirt may gouge and scratch your cork floor. Never vacuum without a soft brush attachment, as this can scratch the floor permanently.;
[c]. Although it may be tempting to scoop the dirt off a basement floor, do so only for tough floors-dust regularly would cause mildew and mold to grow. Provide an air purifier.;
[d]. Sweep hardwood floors over a variety of dusting levels throughout the season. Some people contend that sweeping your floor is best for floors past their prime, following a traditional process that involves some vigorous sweeping.;
[b].