若用如下的SQL语句创建了一个STUDENT表：CREATE TABLE STUDENT(SNO C(4) PRIMARY KEY NOT NULL，;)NAME C(8) NOT NULL，;SEX C(2)，;AGE N(2))下列的SQL语句中可以正确执行的是
A．INSERT INTO STUDENT VALUES('1031','王小平', '男',23)
B．INSERT INTO STUDENT VALUES('1031',.NULL., '男',23)
C．INSERT INTO STUDENT VALUES('1031','王小平',.NULL.,.NULL.)
D．INSERT INTO STUDENT VALUES(.NULL.,'王小平','男',23)