$($a$)$ You have been appointed as a network designer at Company $x$ and are required to design a Wide Area Network $($WAN$)$ that can serve three insurance company offices located at Kedah, Kuala Lumpur and Johor Baharu. Note that, each office has three main departments served by a local area network $($LAN$)$ to facilitate communication and information sharing among the employees. Sketch a wired network configuration to facilitate the communication between the three offices of all departments. Determine and explain the appropriate network devices and the type of cables for the designed network. $[$C$4.$ SP $4][10$ marks$]$