In the figure above, if the first image is the original, the number 5 is a sample of the effects of the ____________________ tool.

Write a method int size(Node tree) that returns the number of nodes in the binary tree whose root is tree.

What will be an ideal response? Assuming a Node class ``` class Node { int element; Node left, right; Node(int el, Node left, Node right) { element = el; this.left = left; this.right = right; } } ```

?Testing two or more programs that depend on each other is called _____.

A. ?integration testing B. ?unit testing C. ?acceptance testing D. ?system testing