根据材料回答2~3题：To keep certain information private and secure while providing remote ac

根据材料回答2~3题：

To keep certain information private and secure while providing remote access for employees，many businesses are creating intranets．An intranet is an（）organizational intemet that is guarded against outside access by a special feature called a firewall(which can be software，hardware， or a combination of the two)．

A．outside

B．external

C．internal

D．inside

请帮忙给出正确答案和分析，谢谢！