An experimenter testing for extrasensory perception has three cards with pictures of a (s)tar, a (c)ircle, and (w)iggly lines. She selects two cards without replacement. Outcomes in the sample space are represented by pairs such as (w,s) and (s,c). Complete parts (a) through (d) below. (a) How many elements are in this sample space? (Type a whole number.) (b) Express the event "a circle appears on one of the cards" as a set. Choose the correct answer below. A. {C,W,S} B. {c} OC. ((c,w).(c.s),(w,c),(s,c)) D. {(c,w), (c,s)} (c) What is the probability that a circle appears on one of the cards? (Type an integer or a simplified fraction.) (d) What is the probability that a star does not appear? (Type an integer or a simplified fraction.)