Express the following sets using the roster method. Express the elements as strings, not n-tuples. (a) {0x:x{0,1}2} (b) {0,1}0{0,1}1{0,1}2 (c) {0x:xB}, where B={0,1}0{0,1}1{0,1}2. (d) {xy : where x{0}{0}2 and y{1}{1}2} (e) {xy:x{aa,ab} and y{a}{a}2}