Question: Python language 10. Write a function that returns the number of keys in a B-tree. 11. Write a method that receives a reference to the

Python language

10. Write a function that returns the number of keys in a B-tree. 11. Write a method that receives a reference to the root of a B-tree and an integer d and returns the smallest key in the tree that has depth d, or -1 if there are no keys at depth d. 12. Write a method that receives a reference to the root of a B-tree and an integer d and returns the sum of all the keys in the tree that have depth d. 13. Write a method that receives a reference to the root of a B-tree and a key k and returns I if k is in an internal node in the tree, 0 if k is in a leaf in the tree, or -1 if k is not in the tree

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