Question: C++ Write a public member function countNodes for a BinaryTree class that will count the number of nodes of a binary tree. If this functions

C++

Write a public member function countNodes for a BinaryTree class that will count the number of nodes of a binary tree. If this functions calls any other function, you must write the code for that function as well. Note that the class BinaryTree has a private member variable root which is a Node pointer.

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