Question: Given a reference - based binary search tree, each node contains element ( used as a key ) , parent, leftChild, and rightChild reference variables.

Given a reference-based binary search tree, each node contains element (used as a key), parent, leftChild, and rightChild reference variables. Provide a method with the signature int numExternal(Node p). This method will count and return the number of external (leaf) nodes for the tree or subtree rooted at p.

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