Consider the relational database above. How many rows will be returned by the following SQL query?

SELECT S$.$Sname, sum$($P$.$Marks$)$

FROM Students $S,$ Performance $P$

WHERE S$.$sid $=$ P$.$sid

GROUP BY S$.$ Sname

The query basically joins the two tables on sid, then groups records by Sname, and then sums up the Marks for each group.

$2$

$3$

$1$

$6$