**Explanation:** - **Insertion:** The `insert` method adds …

**Explanation:**
- **Insertion:** The `insert` method adds a node with a specified key into the tree, placing it in the correct position to maintain BST properties.
- **Search:** The `search` method returns the node with the requested key if it exists or `None` if it doesn't.
- **Deletion:** The `delete` method removes a node with a given key. If the node has two children, it replaces the key with the smallest key in the right subtree and deletes that successor node.