A Wide Area Network (WAN) is the most suitable type of network for connecting multiple sites that are geographically dispersed, such as offices in different cities or countries. It allows for secure communication and resource sharing across wide geographic areas. A Local Area Network (LAN) is limited to a smaller area, typically a single building or campus, and is not designed to cover cities or countries. A Metropolitan Area Network (MAN) covers a city or a metropolitan area and is not intended to connect locations in different cities or countries. A Storage Area Network (SAN) focuses on providing access to consolidated, block-level data storage and is unrelated to geographical connectivity of office locations.