给定某servlet 程序的片段，如下：Public void doGet(HttpServletRequest request,Httpservletresponse response){_________}要把session的失效时间设为30分钟，应该在下划线处插入( )A、request.getSession().setTimeout(1800);B、request.getSession().setTimeout(30)C、request.getSession().setMaxInactiveInterval(1800);D、request.getSession().setMaxInactiveInterval(30);
A.getSession().setTimeout(1800);
B、request.getSession().setTimeout(30)
C、request.getSession().setMaxInactiveInterval(1800);
D、request.getSession().setMaxInactiveInterval(30);