Which of following description of intelligent video quality diagnosis is correct? (Multiple choice)

Which of following description of intelligent video quality diagnosis is correct? (Multiple choice)
A .  When the surveillance camera is blocked by foreign objects, the platform will automatically send out an alarm
B .  When the video transmitted by the surveillance camera back to the platform suffers serious picture jitter, the platform will automatically issue an alarm
C .  When the surveillance camera image is lost, the platform will automatically issue an alarm
D .  When the brightness of the video transmitted by the surveillance camera back to the platform is too low and the picture cannot be seen clearly, the platform will automatically issue an alarm

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Answer: ABCD