Given the following table TABLE EMPLOYEE Column Null? Туре EMP_ID NOT NULL NUMBER EMP_LNAME VARCHAR2(50) EMP_INITIAL VARCHAR2(50) EMP_FNAME VARCHAR2(50) EMP_HIREDATE DATE REGION_ID NUMBER The query that will return the number of employees in each region is SELECT region_id, count(emp_id) FROM employee .a O .b O SELECT region_id, count(emp_id) FROM employee GROUP BY region_id, emp_id SELECT region_id, count(") FROM employee GROUP BY region_id .c O .d o SELECT region_id, count(*) FROM employee GROUP BY emp_id

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