Question: Here is a definition for a datatype called Tree which can be used to represent expression trees. datatype Tree = Leaf of int I Add

Here is a definition for a datatype called Tree which can

Here is a definition for a datatype called Tree which can be used to represent expression trees. datatype Tree = Leaf of int I Add of Tree * Tree I Sub of Tree * Tree; Which of the following represents a complete implementation to evaluate any valid expression tree that takes a Tree and returns an integer

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