When connecting to a pan-tilt-zoom camera to a C-Series codec, what type of cable must be used for camera control?

When connecting to a pan-tilt-zoom camera to a C-Series codec, what type of cable must be used for camera control?
A . an Ethernet crossover cable (RJ45-to-RJ45)
B . an Ethernet cable (RJ45-to-RJ45)
C . a serial cable (DB25-to-DB9)
D . a VISCA cable (DB9-to-RJ45)

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Answer: D