Question: Assume statements S1 and S2 defined as: S1: L2-L1 is recursive enumerable where L1 and L2 are recursive and recursive enumerable respectively. S2: The set of all Turing machines is countable. Which of the following is true?

Options

A : S1 is correct and S2 is not correct

B : Both S1 and S2 are correct

C : Both S1 and S2 are not correct

D : S1 is not correct and S2 is correct

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