A parent is concerned about their child's phone connecting to unknown Bluetooth devices. On iOS, what setting can prevent an iPhone from being discoverable to all nearby Bluetooth devices while still allowing paired devices to connect?

• A.Guided Access has to be switched on because the accessibility lock blocks third-party apps from initiating discovery (the setting lives under Accessibility rather than Bluetooth): paired accessories keep working throughout
• B.A Stealth Mode toggle in the Bluetooth pane hides the handset from nearby scanners because the radio suppresses its advertising frames (the toggle sits beside the master switch): paired devices reconnect normally
• C.iPhones automatically become non-discoverable (not broadcasting their device name to unpaired devices) as soon as the Bluetooth settings pane is closed; paired devices can still reconnect without the device being in discovery mode
• D.Bluetooth has to be switched off in Settings because the radio stops advertising once disabled (the control panel toggle merely disconnects): paired devices lose their link too