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

How to clean outdoor tiles
Sweep the tiles daily.
Try to sweep your porcelain tiles every day or so. Use a soft, natural bristle broom or take a vacuum attachment and suck up the dirt.

Pick from: (i) Regular sweeping will prevent your tiles from becoming caked with dirt and stained. If your porcelain tiles lead up to an entryway for your house, you'll want to sweep them more often.; (ii) Sweep around the tiles to remove any debris and dust. Use a rag and a rough buffing brush for these jobs.; (iii) Focus on using a tack broom or a cookie broom, as your tiles will still be stained. Mop using low strokes and clean up the grime.; (iv) Scrub hard to get out all of the grime and dust. Watch for too much dirt to be efficient enough to vacuum-sweep.;
The answer is:
(i)