给定员工表tb_emp包含字段eno（职工号）、name（姓名）、age（年龄）、salary（工资）和dept（所在部门），要统计“市场部”的员工人数，正确的语句是( )

A. SELECT dept, COUNT(*) FROM tb_emp GROUP BY dept HAVING dept='市场部';
B. SELECT dept, TOTAL(*)FROM tb_emp GROUP BY dept='市场部';
C. SELECT dept, COUNT(*) FROM tb_emp GROUP BY dept ='市场部';
D. SELECT dept, SUM(*) FROM tb_emp GROUP BY dept HAVING dept='市场部';