A company has two buildings that are 50 meters (roughly 50 yards) apart. Between the buildings is private land owned by the company. A large walk-through tunnel connects the two buildings. In one building is a collection of 30 computer workstations; in the other building is a mainframe computer. What is the best way to connect the workstations to the mainframe computer? Explain your reasoning and all the possible solutions you considered. (Here, you need to consider HK communications regulations developed by OFTA)