K	P	G
1	0	red
2	NULL	red
3	0	blue
4	9	red
5	NULL	blue

Table T has 5 rows of 3 columns of data as shown above, where NULL means no data.

The following statement

SELECT P, G, COUNT(*) as Total FROM T GROUP BY P, G;

should return a table containing

a.) 5 rows b.) 3 rows c.) 1 row d.) zero row