Question: Why does function preorder 2 ( ) presented in the Traversal module make only half as many recursive calls as function preorder ( ) ?

Why does function preorder 2() presented in the Traversal module make only half as many recursive calls as function preorder()?
Because there are half as many leaf nodes
Because only internal nodes get called
Because there are half as many nodes
Because half of the pointers are null
Why does function preorder 2() presented in the Traversal module make

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