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The correct answer is B.

OBJ-2.1: A hub is a network hardware device for connecting multiple Ethernet devices together and making them act as a single network segment. A hub operates at the physical layer (Layer 1) of the OSI model. All devices connected by a hub are in a single collision domain and a single broadcast domain, therefore they must use half-duplex for communication and CSMA/CD. A switch is networking hardware that connects devices on a computer network by using packet switching to receive and forward data to the destination device. A switch operates at the data link layer (Layer 2) of the OSI model and makes switching decisions based upon MAC addresses. Each switchport on a switch is a separate collision domain, but all switchports are in a common broadcast domain. A switch is networking hardware that connects devices on a computer network by using packet switching to receive and forward data to the destination device. A switch operates at the data link layer (Layer 2) of the OSI model and makes switching decisions based upon MAC addresses. Each switchport on a switch is a separate collision domain, but all switchports are in a common broadcast domain. A router is networking hardware that connects computer networks and forwards data packets between those networks. A router operates at the network layer (Layer 3) of the OSI model and makes routing decisions based upon IP addresses. Each switchport on a router is a separate collision domain and a separate broadcast domain.

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