如果学生表student是使用下面的SQL语句创建的
CREATE TABLE student(学号 C(4)PRIMARY KEY NOT NULL,;
姓名 C(8),;
性别 C(2),;
年龄 N(2) CHECK(年龄＞15 AND年龄＜30))
下面的SQL语句中可以正确执行的是( )。

A．INSERT INTO student(学号,性别,年龄)VALUES("0542","男",17)

B．INSERT INTO student(姓名,性别,年龄VALUES("李蕾","女",20)

C．INSERT INTO student(姓名,性别,年龄)VALUES("男",25)

D．INSERT INTO student(学号,姓名)VALUES("0897","安宁",16)

Eleni and Panicos are the directors of Best Toys Ltd, a private limited liability company trading in the toy industry. Both Eleni and Panicos are employed by Best Toys Ltd on a three-year contract, which started in January 2006. In November 2008, Eleni left on maternity leave. Julia, who is the majority shareholder of Best Toys Ltd, wishes to replace Eleni because she considers her services to be inadequate.Required:Advise Julia. (10 marks)