创建存储过程的片断如下：创建成功后，以下（）调用方式是正确的。（选择一项） create procedure proc_score @passed int = 60, @count int output as  select count(*) from scores where score < @passed 
A、execute proc_score @count int output 
B、declare @count int  execute proc_score 70,@count output
C、declare @count int output execute proc_score 70,@count
D、execute proc_score 70,@count output