Which of the following is not a characteristic of a binary search tree?
A. Each node has zero, one, or two successors.
B. The preorder traversal processes the node first, then the left subtree, and then the right subtree.
C. There are only six possible tree traversals.
D. Data are processed in key sequence when the tree is traversed using an inorder traversal.
E. The key of all nodes on the left subtree are greater than or equal to the key of the node.
Answer: E
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