Which of the following best illustrates the concept of WAN?

The concept of a Wide Area Network (WAN) is best illustrated by linking remote locations through the Internet. WANs are designed to cover broad geographic areas, which may encompass cities, countries, or even global distances. This type of network enables various locations to communicate and share resources over vast distances, typically utilizing existing telecommunication infrastructure, such as the Internet.

In contrast, the other scenarios are examples of more localized networks. Connecting two computers in a single room describes a Personal Area Network (PAN) or a very small Local Area Network (LAN). Establishing a local network in a coffee shop also refers to a LAN, which typically spans a limited area, like a building. Similarly, creating a single-user personal network would not qualify as a WAN since it serves an individual within a small vicinity rather than linking multiple distant sites. Thus, option linking remote locations best aligns with the characteristics and purpose of a WAN.