Question:How many groupings are generated when CUBE is used with the GROUP BY clause of SQL Server 2008? 

A n (n= number of expressions in the element list passed to CUBE) 

B n+1 (n= number of expressions in the element list passed to CUBE) 

C 2^n (n= number of expressions in the element list passed to CUBE) 

D 2^n+1 (n= number of expressions in the element list passed to CUBE) 

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