For each relation, decide whether or not it is a function. Relation 1 Relation 2 Domain Range Domain Range tree -3 pen 4 -4 desk O Function O Not a function O Function O Not a function Relation 3 Relation 4 ((c, t), (m, a), (t, t), (a, t) ) ((-7, m). (0, a). (-9, a). (-7, a)) O Function O Function Not a function O Not a function