Regarding the description of the device simulator, which one is correct ()? (multiple choice)

In device management, DM Server passes commands to the gateway through the () protocol to complete the configuration management of the device?

Among the following options, the problem that is not a smart manhole cover can deal with is ()?

In the following options, the terminal access method that is not commonly used in smart homes is ()?

After the gateway is started, the device carries the Device ld and password to access OceanConnect, and OceanConnect verifies the legitimacy of its authentication and returns () if it is legitimate