Let C(x, y) denotes "x and y played chess" and the domain of x and y be all chess players. The expression 3x(C(x, Beth) A Vy(y + Beth -C(x, y))) means: a. If some player has played with Beth, then that person has not played anyone else. O b. Beth has played chess with everybody. O c. There exists a unique player who Beth has played with. O d. There is somebody who has played chess with Beth only. O e. Beth has played chess with at least one other chess player