II. Tell whether the following is a function or a relation. 1.{(-2,-4), (-1,-3), (0, -2), (1,-1)} 2. {( 4, 2)), (4,0), (3, 3), (3,5)} 3. {(-1,0), (0, 1), (1, 2), (2,3)} 2 4. 7 5. 4​