Given the BinaryTree Class Discussed in Section 17

question 20

Multiple Choice

Given the BinaryTree class discussed in section 17.2 (partially shown below) , select an expression to complete the static recursive helper method countLeaves, which returns the number of leaf nodes in the binary tree rooted at node n. public class BinaryTree
{
Private Node root;
Public BinaryTree()
{
Root = null;
}
Public BinaryTree(Object rootData, BinaryTree left, BinaryTree right)
{
Root = new Node() ;
Root.data = rootData;
Root.left = left.root;
Root.right = right.root;
}
Class Node
{
Public Object data;
Public Node left;
Public Node right;
}
Public int countLeaves()
{
Return countLeaves(root) ;
}
Public static int countLeaves (Node n)
{
If (n == null)
{
Return 0;
}
Else if (_____________________)
{
Return 1;
}
Else
{
Return countLeaves(n.left) + countLeaves(n.right) ;
}
}
}

• A) n.left == null
• B) n.right == null
• C) n.left == null && n.right == null
• D) n.left == null || n.right == null

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Definitions:

Electrode

A conductor through which electricity enters or leaves an object, substance, or region, often used in scientific experiments or medical procedures.

Reticular Formation

A complex network of nerve pathways in the brainstem involved in consciousness and controlling several basic functions of arousal and attention.

Neural Connections

Synapses and pathways through which neurons communicate with each other, forming the foundation of all brain functions and activities.

Coma

A deep state of prolonged unconsciousness in which a person cannot be awakened or respond to stimuli.