In which scenario would you use the ROLLUP operator for expression or columns within a
GROUP BY clause?
A.
to find the groups forming the subtotal in a row
B.
to create group-wise grand totals for the groups specified within a GROUP BY clause
C.
to create a grouping for expressions or columns specified within a GROUP BY clause in one
direction, from right to left for calculating the subtotals
D.
to create a grouping for expressions or columns specified within a GROUP BY clause in all
possible directions, which is cross-tabular report for calculating the subtotals