Which characteristic should be considered by a network designer when implementing a VoIP solution?

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Which characteristic should be considered by a network designer when implementing a VoIP solution?

VoIP traffic is generally classified as low priority.
VoIP centrally routes calls in the same manner as a traditional PBX.
VoIP traffic is highly reliable because of retransmission of dropped packets.
VoIP can make use of QoS features to help reduce interruptions in communication.