When designing a video communications network, which type of video communication link is two-person videoconferencing?

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When designing a video communications network, which type of video communication link is two-person videoconferencing?
A . Point-to-multipoint bidirectional
B. Point-to-multipoint unidirectional
C. Unidirectional
D. PTP unidirectional
E. PTP bidirectional

Answer: D