The correct answer is C. wireless wide area network (WWAN).
A WWAN is a telecommunications network that offers wireless coverage over a large geographical area, typically over a cellular phone network. It is a type of wide area network (WAN), which is a network that covers a large geographic area, such as a city or country. WWANs are typically used for mobile devices, such as smartphones and laptops, to connect to the internet.
A PAN is a personal area network that connects devices within a short range, such as within a room or office. A WAP is a wireless application protocol that allows mobile devices to access the internet. A WLAN is a wireless local area network that connects devices within a small area, such as a home or office.
Here is a table that summarizes the key differences between WWANs, PANs, WAPs, and WLANs:
| Network type | Coverage area | Devices connected | Typical use cases |
| — | — | — | — |
| WWAN | Large geographical area | Mobile devices | Internet access on the go |
| PAN | Short range | Personal devices | Connecting devices within a room or office |
| WAP | Wireless application protocol | Mobile devices | Accessing the internet on mobile devices |
| WLAN | Small area | Computers, laptops, smartphones | Connecting devices within a home or office |