表tbl（a,b,c) 有索引idx_a_b（a,b) ,下列查询sql语句可以使用这个索引的有：

A、select * from tbl where a=xxx order by b;

B、select c from tbl where a=xxx and b＞xxx and b＜xxx＞ C、select * from tbl where b=xxx and c=xxx;

D、select c from tbl order by b;