Which of the following design principles refers to the symmetrical, asymmetrical or radial positioning of elements in a composition?

A text box control represents the actual value of a field and is an unbound control

Indicate whether the statement is true or false

Write a method int numberLeaves(Node tree) that returns the number of leaves 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; } } ```