The cable modem links which two devices in a high-speed data network?

The correct answer highlights the essential role of a cable modem in connecting devices so that they can communicate and access the internet. In a high-speed data network, a cable modem serves as the bridge between the internet service provided by the cable company and the internal network, which typically includes devices such as personal computers and set-top boxes.

When connecting a personal computer and a set-top box, the cable modem facilitates the data transmission from the internet to these devices, enabling them to send and receive data effectively. This is crucial for activities such as browsing the web or streaming video content. The cable modem converts data from the cable system into a format that these devices can understand and vice versa, ensuring smooth and efficient operation.

While the other choices involve various electronic devices and connections, they do not accurately represent the primary function of a cable modem in linking devices that access the internet. The focus on the personal computer and set-top box reflects common usage scenarios in households, making this connection the most relevant and accurate in the context of a high-speed data network.