Cisco Video Surveillance Video Encoder cards perform which function?

Cisco Video Surveillance Video Encoder cards perform which function?
A . the ability to use existing analog equipment with an IP-enabled video surveillance system
B . the ability to convert low-resolution video to high-definition video for video surveillance
C . the ability to stream digital media to digital media in an IP-enabled video recording environment
D . the ability to encrypt raw video signals to secure video signals

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Answer: A