Refer to the exhibit. The auto discovery qos command was configured on this interface 24 hours prior to the above configuration. Which statement is true about the configuration?（）

• A、 An IP address is needed on interface seriall/2.
• B、The auto discovery qos command should be configured on the subinterface
• C、A generated AutoOoS policy has been applied to serial1/2.
• D、The collection of data has stopped.