The set of natural numbers is closed under the binary operations of

1.	The set of natural numbers is closed under the binary operations of
A.	addition, subtraction, multiplication and division.
B.	addition, subtraction, multiplication but not division.
C.	addition and multiplication but not subtraction and division.
D.	addition and subtraction but not multiplication and division.
Answer» D. addition and subtraction but not multiplication and division.

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The set of natural numbers is closed under the binary operations of

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