Mobile computers, such as laptops and handheld computers, are one of the fastest-growing segments of the computer industry. Their sales have already overtaken those of desktop computers. Why would anyone want one? People on the go often want to use their mobile devices to read and send email, tweet, watch movies, download music, play games, or simply to surf the Web for information. They want to do all of the things they do at home and in the office. Naturally, they want to do them from anywhere on land, sea or in the air. Wearable computers are another promising application. Smart watches with radios have been part of our mental space since their appearance in the Dick Tracy comic strip in 1946; now you can buy them. Other such devices may be implanted, such as pacemakers and insulin pumps. Some of these can be controlled over a wireless network. This lets doctors test and reconfigure them more easily. It could also lead to some nasty problems if the devices are as insecure as the average PC and can be hacked easily. Source: Tanenbaum, Andrew, and David J Wetherall. " COMPUTER NETWORKS." -5th Editions (2011). Answer the following questions: a. "These fastest-growing segments of the computer industry will create increasing challenge for the Network managers in planning and managing the network". Discuss this statement with respect to factors that contributed to increase challenge for planning and managing the network. (4 Marks) b. Discuss the difference between LAN (Local Area Networks) and WAN (Wide Area Networks) by using a picture. (4 Marks) c. Why do we need high speed LANs today? Discuss by using examples. (2 Marks)