What is the minimal amount of cables needed in order to connect an Appliance to an Orchestrator?

What is the minimal amount of cables needed in order to connect an Appliance to an Orchestrator?
A . Three cables: uplink, downlink, SYNC
B. One Downlink cable only
C. Two cables: one uplink and one downlink
D. Four cables: uplink, downlink, SYNC and Management

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Answer: B