Amore efficient design which involves the logical separation of a switch ports into different broadcast domains is known as a

Virtual local-area network (VLAN)

Explanation:Virtual LAN(local area network) is the network that works on the particular geographical environment/domain in separative way by pretending to be working in the same local area.

This network works to maintain the security and network management in the geographical area .It is implement to gain the scalability and adaptability to the changes occurring in the network.

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i want to say d but i could be wrong however it is organized if that could happen..

hope it could