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The correct answer relates to the relationship between port cost and link speed in Rapid Spanning Tree Protocol (RSTP). In RSTP, each port on a switch is assigned a cost based on its link speed, which influences how the spanning tree algorithm determines the best path in a network.

The standard port costs for Ethernet speeds are defined in RSTP as follows: a cost of 2,000 corresponds to a link speed of 10 Gbps. The calculation of port cost is based on a formula where a lower port cost indicates a faster link. For example, the cost for a 10 Gbps link is defined as 2,000, while a 1 Gbps link would generally have a cost of 4,000.

When considering the port cost of 2,000, it aligns precisely with the 10 Gbps link speed. Therefore, understanding this relationship is crucial for recognizing how RSTP functions in determining the best paths for data transmission within a network.