Design and Explain (no code!) a recursive algorithm to count the number of leaf nodes in any given BST. Assume you have the following available: • Node class is defined (Node contains: integer "key", pointers to left and right nodes. Constructor takes in a value for key, and initializes right/left pointers to nullptr) • A tree is pre-built with all connections made. A pointer named "root" is given, which points to the root node Your algorithm should only need a pointer to the root node in order to work • Your algorithm should aim to return the total number of leaf nodes in the tree . Be sure to explain the base and general case(s) for your algorithm

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