Define sets u, a, b, and c as shown below. find (aub)o(auc). u = {a, b,c, d,e, f.g. h} a={d, f,g} b = {afg} c= {a, b,c, e h} select the correct choice below and, if necessary, fill in the answer box within your choice. o a. (aub)(auc)= { } (use a comma to separate answers as needed. type each answer only once.) ob. (aub)n(auc) = 0