Given the task definition and input, reply with output. In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

The B variety of this structure forms the backbone of NTFS and btrfs [butter-eff-ess]. Red-black and splay are binary self-balancing varieties of this data structure. Kruskal's and Prim's algorithms find a minimum-spanning one of these structures. An example of this where all(*) children are smaller than their parent is called a heap. They consist of nodes that point to exactly one other node. For 10 points, name this class of undirected, acyclic, connected graphs that also name a data structure with a root, branches, and leaves.

Literature