Which of the following descriptions of traditional Bluetooth operation is correct for HarmonyOS devices?

Before you start Bluetooth scanning, you need to register for a broadcastBluetoothRemoteDevice.EVENT_DEVICE_DISOOVERED

can initiate a Bluetooth device scan through the startBtDiscovery() interface

If you want to get the scanned device, you must inherit the onReceiveEvent (CommonEventData data) method that implements the CommonEventSu business scriber class when you register the broadcast, and receive the EVENT_DEVICE_DISCOVERED broadcast

You can use the getLocalName() interface to check whether Bluetooth is turned on