A $\_\_\_\_\_\_\_\_\_\_\_\_\_$ backbone network is a new type of LAN$/$BN architecture made possible by $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ that assign computers to LAN segments via $\_\_\_\_\_\_\_$

Question $5$ options:

Virtual LAN, hubbed switches, hardware.

Virtual LAN, high speed routers, firmware.

Virtual LAN, intelligent$-$high speed switches, software.

bridged backbone, intelligent$-$high speed switches, hardware.