Final answer:
A Campus Area Network (CAN) is the best option for Saul's tech company's inter-building connectivity, as it provides high-speed networking tailored for multiple buildings in close proximity.
Step-by-step explanation:
The best network option for Saul, who runs a successful tech company and wants to set up a network across five buildings, is a Campus Area Network (CAN). A CAN is specifically designed to interconnect networks within a limited geographic area, such as a university campus, a military base, or, in this case, a cluster of buildings owned by a company.
It offers high-speed networking capabilities over a larger area than a traditional Local Area Network (LAN) but is smaller than a Metropolitan Area Network (MAN). A CAN would allow smooth sharing of resources and communications between the buildings while being efficient and secure. WLANs are generally for smaller, more localized environments, and MANs cover broader, city-wide areas, so they are not the optimal choices for this scenario.