QWhat is a perfect binary tree?

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• A A binary tree in which every node has either one or two children ✔ ✖
• B A binary tree in which every node has exactly two children ✔ ✖
• C A binary tree in which all leaf nodes are at the same level and every non-leaf node has two children ✔ ✖
• D A binary tree in which all leaf nodes are at the same level and every non-leaf node has either one or two children ✔ ✖

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