A Wireless Wide Area Network (WWAN) provides network connectivity over a vast geographical area, such as a state, province, or country. It utilizes cellular network technologies like LTE, 4G, and 5G, which are designed by telecommunications providers to cover extensive regions. This scale is significantly larger than that of a city, campus, or a single building. Therefore, "Region" is the term that best describes the typical coverage area of a WWAN.

A. City: A city-wide wireless network is more accurately classified as a Wireless Metropolitan Area Network (WMAN).

B. Campus: A campus area is typically serviced by one or more interconnected Wireless Local Area Networks (WLANs).

D. In-building: In-building wireless coverage is the primary domain of a Wireless Local Area Network (WLAN).

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1. CWNP. (2022). CWISA-103 Certified Wireless IoT Solutions Administrator Official Study Guide. Chapter 1: Introduction to IoT, Section: "Wireless Network Types," pp. 12-14. The guide explicitly defines a WWAN as covering a "wide geographical area, such as a state, province, or country," which aligns with the term "Region." It contrasts this with WMANs (city), WLANs (campus/building), and WPANs (personal space).

2. Kurose, J. F., & Ross, K. W. (2021). Computer Networking: A Top-Down Approach (8th ed.). Pearson. Chapter 7: "Wireless and Mobile Networks." The text describes cellular networks, the technological foundation of WWANs, as systems designed to provide voice and data connectivity to mobile users over large geographic areas, often on a national or regional scale.

3. Stallings, W. (2016). Data and Computer Communications (10th ed.). Pearson. Chapter 12: "Wireless Networking." This textbook categorizes wireless networks by range, placing WWANs at the largest scale for regional and national coverage, distinct from WLANs and WMANs which cover smaller areas like buildings and cities, respectively.