Decide which of the 5 properties of a commutative group (closure, identity, inverse, associative, commutative) hold for the given system.
A. All of them
B. Closure, identity, associative, and commutative only
C. Closure, identity, inverse, and commutative only
D. Closure, identity, and inverse only
Answer: D
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?
A. ?
B. 
C. ?
D. ?
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A. 
B. 
C. 
D. 
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A. 
B. 
C. 
D. 
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