Question: Modify Binary_tree to take a parameter (or parameters) to indicate what kind of line to use to connect the nodes (e.g., an arrow pointing down

Modify Binary_tree to take a parameter (or parameters) to indicate what kind of line to use to connect the nodes (e.g., an arrow pointing down or a red arrow pointing up). Note how this exercise and the last use two alternative ways of making a class hierarchy more flexible and useful.

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