Which of the following systems is used to connect the data cascade interface of the visual library?

Which of the following systems is used to connect the data cascade interface of the visual library?
A . The upper and lower levels of video image database systems are interconnected, and the video private network video sharing platform is interconnected with the public security information network video sharing platform
B . The interconnection of the video image database system of the upper and lower levels, the interconnection of the video image database system of the video private network and the video image database system of the public security information network
C .  Interconnection of the upper and lower video sharing platforms, the video sharing platform of the private network and the video sharing platform of the public security information network
D . The upper and lower video sharing platforms are interconnected, and the video image database system of the video private network is interconnected with the video image database system of the public security information network.

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Answer: C