Calling a member function of an object requires which item?

The ________ is the first argument of the IF function

A) logical test B) if true statement C) value comparison D) if false statement

In a preorder traversal of a binary tree, after visiting a node and before moving to the right subtree, we must save a pointer to the node so that after visiting the right subtree, we can visit the left subtree.

Answer the following statement true (T) or false (F)