下面声明一个名为cursor_student的游标,语法格式正确的是
A. CURSOR cursor_student OF select s_name,s_gender FROM student;
B. CURSOR cursor_student FOR select s_name,s_gender FROM student;
C. DECLARE cursor_student CURSOR FOR select s_name,s_gender FROM student;
DECLARE cursor_student CURSOR OF select s_name,s_gender FROM student;