ABC is a global company which is recently moved to Australia. ABC want to establish 4 offices within Australia (Sydney, Perth, Brisbane and Melbourne). Sydney office will have 100 employees. Perth office will have 50 employees. Brisbane office will have 30 employees. Melbourne office will have 10 employees. You have been hired as Network Administrator. Answer the following questions. a. Calculate subnet masks that will satisfy the number of employees at each site. b. List all possible devices and equipment you may need for LAN and WAN. Describe the purpose and role of these devices. c. Which routing protocol will you use? Why? d. Which WAN topology will you use if the organization wants centralized management at the Headquarter located in Sydney? Justify your