--- I’ll come to see your performance at 9:00 tomorrow evening.

--- I’m sorry, but by then my performance ____ and I ____ reporters in the meeting room.

A．will have ended; will be meeting

B．will end; will meet

C．will be ended; am going to meet

D．is to end; will meet

将内部网和公众访问网（如Internet）分开的硬件或软件技术指的是（）

A.集线器

B.交换机

C.防火墙

D.网关