A user is at the office and has a cellular phone that previously functioned properly. The phone is powered on with a fully charged battery. However, the phone does not have connectivity. Which of the

Disconnecting from WiFi would only affect Wi-Fi connectivity; cellular data and calling would still function, so the phone wouldn't lack all connectivity.

While possible, a provider conducting system testing is a less direct and less common first-troubleshooting step for an individual phone's lack of connectivity compared to a local phone setting.

A 'bad' or incorrect MAC address typically does not prevent a phone from attempting to connect to networks; issues with MAC addresses are more related to network access control rather than a complete lack of connectivity.

Airplane mode disables all wireless communication features, including cellular, Wi-Fi, and Bluetooth, preventing the phone from connecting to any network even when powered on and charged. This is a common user-initiated setting that would cause a complete lack of connectivity.