Two common categories of formula errors in Excel are syntax errors and logic errors.

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; } } ```

Which command is used to display a list of all environment variables and their stored values?

A. dev B. $echo C. env D. dvar