7. Given the universal set -(a, b, c, d, e, f, 1, 2, 3, 4, 5, 6, 7, 8,9 let A = { a,b) , B= { a,c,2,4,6), C- 1,2,3,4) and D-0 Give the contents, cardinality value, or value of the following. a) A B b) the relation on A C in which the second element of the ordered pairs is larger than 3