MySQL中，要统计每个班级中男女生的数量，正确的SQL语句是（）。
（A）select gender,count(gender) from student group by gender
（B）select class,gender,count(*) from student group by gender
（C）select class,gender,count(*) from student group by class,gender
（D）select class,gender,count(*) from student group by class
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