Which of the Following Statements About Trees Is NOT Correct

Which of the following statements about trees is NOT correct?

A) The height of a tree is based on the longest path from the root to a leaf.
B) Many tree properties are computed with recursive methods.
C) A simple implementation of a Tree class uses an instance variable for the root node and a nested Node class, which stores the node's data and its children.
D) A subtree rooted at node n is the tree formed by taking n as the root node and including all of its ancestors.