连接MySQL数据库的正确方法是() A: mysqli_open("localhost"); B: mysqli_connect("localhost"); C: connect_mysqli("localhost"); D: dbopen("localhost");

连接 MySQL 数据库的正确方法是( ) A: mysql_open("localhost","root","root"); B: mysql_connect("localhost","root","root"); C: connect_mysql("localhost","root","root"); D: dbopen("localhost","root","root");