查询2001年所签订单的信息,并按金额降序排序,正确的SQL命令是
A. SELECT * FROM 订单 WHERE YEAR(签订日期)=2001 ORDER BY 金额 DESC
B. SELECT * FROM 订单 WHILE YEAR(签订日期)=2001 ORDER BY 金额 ASC
C. SELECT * FROM 订单 WHERE YEAR(签订日期)=2001 ORDER BY 金额 ASC
D. SELECT * FROM 订单 WHILE YEAR(签订日期)=2001 ORDER BY 金额 DESC