查看EMPLOYEES表的说明：NAMENULLNAME----------------------

单项选择题

查看EMPLOYEES表的说明：NAMENULLNAME-------------------------------------EMPLOYEE__IDNOTNULLNUMBER2FIRST__NAMEVARCHAR2LAST__NAMENOTNULLNUMBERSALARYVARCHAR2（6,哪两条语句将成功运行（）

A.SELECT"Thefirst_nameis/""first_name"/""FROMemployees
B．SELECT"Thefirst_nameis"""first_name""""FROMemployees
C．SELECT"Thefirst_nameis"""first_name"""FROMemployees
D．SELECT"Thefirst_nameis"first_name""FROMemployees
E．SELECT"Thefirst_nameis""first_name""FROMemployees