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The correct answer is B.

OBJ-2.1: A broadcast domain is a logical division of a computer network in which all nodes can reach each other by broadcast at the data link layer. A broadcast domain can be within the same LAN segment, or it can be bridged to other LAN segments. Routers break up broadcast domains. Therefore there are two broadcast domains in this network – one for each side of the router (the three switches make up one broadcast domain, and the hub makes up the second broadcast domain)./span>

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