The set of all real numbers under the usual multiplication operation is not a group since

multiplication is not a binary operation

multiplication is not associative

identity element does not exist

The set of all real numbers under the usual multiplicatio

1.	The set of all real numbers under the usual multiplication operation is not a group since
A.	multiplication is not a binary operation
B.	multiplication is not associative
C.	identity element does not exist
D.	zero has no inverse
Answer» E.

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&nbsp;&nbsp;The&nbsp;set&nbsp;of&nbsp;all&nbsp;real&nbsp;numbers&nbsp;under&nbsp;the&nbsp;usual&nbsp;multiplication&nbsp;operation&nbsp;is&nbsp;not&nbsp;a&nbsp;group&nbsp;since

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The set of all real numbers under the usual multiplication operation is not a group since