please refer to the photo. I don't quite understand this question

What is the sample space for an experiment that consists of drawing two balls, one at a time without replacement out of a bag that contains 3 red balls, 4 white balls, and 6 green balls? OS = {r, r, r, g, g, 8, 8, 8, 8, W, W, w, w} OS = {rr, rw, rg, wg, ww, gg } OS = {rrr, www, ggg, rwg, rrg, rrw, ggw, ggr, wwr, wwg} OS = {rr, rw, wr, rg, gr, wg, gw, ww, gg}