Using Java, write and test a copy constructor for the Binary Search Tree class. A copy constructor takes a reference to a BST and creates a copy. Note that you cannot just copy the root reference. You must go through the original tree and create copies of all the nodes. This is easiest to do with a recursive function that takes a parameter that is a Node. If the Node is null, return null, else return a new node that contains as data a copy of the original Node object,data, and the left and right references refer to copies of the left and right subtrees of the original Node. These copies are returned by recursive calls to the copy function. This is called making a deep copy. Test the constructor by creating a tree, making a copy of it, and then modifying the copy. Print out both the original tree and the copy to show they are actually different trees.