Question: Why is data D a = Fork a (D a) | a -> a not a correct data type definition? Functions cannot appear in the

Why is data D a = Fork a (D a) | a -> a not a correct data type definition? Functions cannot appear in the definition of a data type. Type synonyms should be declared using the newtype keyword. Fork is a constructor used for trees. Datatype declarations cannot be recursive. None of the above

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