If R= {1, 5, 6, 8} and T = {1, 5, 7}, find the following sets. (A) {x XER or XET} (B) RUT . . .. . (A) Select the correct choice below and fill in any answer boxes present in your choice. OA. {x| XER or XET} = { }(Use a comma to separate answers as needed.) OB. 150} Determine whether or not the sets P\" and E' are disjoint. T = {nEN| n