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D. virtual circuit network is implemented in application layer
Virtual Circuit Network (VCN) involves several characteristics as it provides a communication mechanism across networks. Options might include features such as:
1. Connection-oriented service: VCNs establish a path or circuit before any data transfer begins between the source and the destination.
2. Packet switching: Data is divided into packets, which are then transmitted through the network.
3. Predefined path: Once the virtual circuit is established, all packets between the source and destination follow the same path.
4. Variable packet sequence: This is not a characteristic of Virtual Circuit Networks. Instead, VCN ensures that packets arrive in sequence. In contrast, in connectionless networks or datagram networks, packets may arrive out of order and need resequencing.
Therefore, the correct answer is: Variable packet sequence.