Which one of the following statements is false? A full binary tree has an even number of vertices. A binary tree is an m-ary with m = 2. In an m-ary tree, each internal vertex has at most m children. In a full m-ary tree, each internal vertex has exactly m children. 12) Let A = {1,2,3,4,5) and define a binary relation R among the subsets of A as follows: XRY X