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A binary tree with 27 nodes would have 28 null branches.
Explanation: In a full binary tree, the number of null branches (also referred to as external nodes or leaf nodes in some contexts) can be found using the formula: null branches = total nodes + 1. This is because every node has two children, and when you have a complete binary tree, the last level of nodes will not have any children (these non-existent children are represented by null branches). Thus, for 27 nodes, there would be 27 + 1 = 28 null branches.
D. none of the above