Let A={2, 4} and B={1, 3, 5} and define relations U, V, and W from A to B as follows: For all (x, y) $$\in A \times B$$. $$( x , y ) \in U$$ means that y-x>2. (x, y)$$\in V$$ means that $$y - 1 = \frac { x } { 2 }$$. W={(2, 5), (4, 1), 2, 3)}. a. Draw arrow diagrams for U, V, and W. b. Indicate whether any of the relations U, V, and W are functions.