Which two statements are true about the GROUPING function?

Which two statements are true about the GROUPING function? (Choose two.)

A.
It is used to find the groups forming the subtotal in a row.

B.
It is used to identify the NULL value in the aggregate functions.

C.
It is used to form the group sets involved in generating the totals and subtotals.

D.
It can only be used with ROLLUP and CUBE operators specified in the GROUP BY clause.