Which type of system is powered by a network for broadband communications?

The correct choice is indeed the option that refers to "Network-Powered Systems." This type of system relies on a broadband communication network to deliver power along with data, which is essential for various applications such as VoIP phones, security cameras, and other devices that require both connectivity and power.

Network-powered systems utilize technologies like Power over Ethernet (PoE) to enable devices to draw power from the same cable used for data transmission. This integration simplifies the installation of powered devices, reduces wiring complexity, and allows for more versatile system design, making it a popular choice in modern network installations.

The other types of systems mentioned may not specifically focus on being powered through a broadband network. For example, premises-powered systems typically refer to devices that are directly powered from a local power source rather than through a network. Signal amplifier systems are designed to boost signal strength rather than provide power, and wireless access systems primarily focus on providing connectivity without necessarily being powered through a broadband network. Thus, the focus on broadband communication and power delivery makes the choice of network-powered systems the resonant answer in this context.