Which statement about the transmission system is true?

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The transmission system is the interconnected high‑voltage backbone of the electric grid that moves large amounts of power from where it is generated to where it will be used, feeding the distribution networks and load centers. This network is designed to carry power over long distances efficiently, which is achieved by stepping voltages up for transmission and down for distribution. Because it spans regions and connects many generating sources, it forms a grid that allows power to flow where it’s needed and to balance supply and demand across the network.

That’s why describing it as interconnected and known as the Transmission grid is the best choice: it captures the idea that this system links multiple generators and loads into a single, wide-reaching network. The other statements don’t fit the role of the transmission system: it does not operate at very low voltages, it is connected to generation to move power, and it serves more than a single city across a broad area.