In a binary tree, the node that is directly above another node is called the _____ of that node.a)childb)siblingc)parentd)leaf

In a binary tree, the node that is directly above another node is called the parent of that node.

Explanation:

• Parent Node: In tree data structures, a parent node is a node that has one or more child nodes below it. For instance, if node A has node B connected beneath it, then A is the parent of B.
• Child Node: This term refers to nodes that are directly below another node. In the previous example, B would be the child of A.
• Sibling Nodes: These are nodes that share the same parent. For example, if A has another child node C, then B and C are siblings.
• Leaf Node: A leaf node is a node that does not have any children. It is located at the end of a branch in the tree.

Thus, the correct answer to the question is c) parent.