以下哪句分组统计查询语句可能正确

以下哪句分组统计查询语句可能正确

A."select a1,sum(a3) from ab where a2>0 and count(1)>1 group by a1;"

B.select a1,sum(a3) from ab group by a1 having a2>0 and count(1)>1;

C."select a1,sum(a3) from ab where a2>0 and count(1)>1 group by a1;"

D."select a1,sum(a3) from ab where a2>0 group by a1 having count(1)>1;"

正确答案是D