Solution

The correct answer is Red-Black

Key Points

• A 2-3-4 tree is a type of search tree data structure in computer science that is also known as a B-tree of order 4.
• In a 2-3-4 tree, each internal node can have 2, 3, or 4 child nodes, and the tree is balanced in such a way that all the leaves are at the same level.
• Red-Black trees are another type of binary search tree with additional properties that ensure balance.
• They are used to maintain a balanced search tree, which helps in ensuring efficient search, insertion, and deletion operations.
• The isometry between 2-3-4 trees and Red-Black trees means that there is a one-to-one correspondence between their structures.
• For every 2-3-4 tree, there exists a corresponding Red-Black tree, and vice versa, such that the operations on the trees are equivalent.

This isometric relationship makes it possible to convert between the two structures while preserving the order and balance properties. Therefore, the correct option is 4) Red-Black trees.