I. Circle the best answer to the following questions. Single answer multiple choice. (6 Marks) 1) If two vertices are connected by two or more edges, these edges are called a) loop b) parallel edge c) weighted edge d) directed edge 2) For an Integer object with value 20, what is its hashCode? a) 10 b) 20 c) 30 d) 40 3) Theof a node is the height of its right subtree minus the height of its left subtree. a) balance factor b) depth c) length d) degree Theis to visit the nodes level by level. First visit the root, then all children of the root from left to right, then grandchildren of the root from left to right, and so on. a) inorder traversal b) preorder traversal c) postorder traversal d) breadth-first traversal 5) 5. Theis to visit the left subtree of the current node first, then the current node itself,a finally the right subtree of the current node. a) inorder traversal b) preorder traversal c) postorder traversal d) breadth-first traversal 6) The of a node is the length of the path from the root to the node. a) length b) depth c) height d) degree