Final answer:
The minimum requirements for an xDSL circuit are a modem, microfilter, and DSLAM. A router is not a minimum requirement but is commonly used in home networks. These components help facilitate and manage DSL internet connections.
Step-by-step explanation:
The minimum requirements for an xDSL circuit include a modem, which is necessary to modulate and demodulate the signals over a telephone line for Internet access. Additionally, a microfilter is typically required to separate the frequencies of the DSL signal from voice signals, preventing interference with traditional voice service over the same line. Lastly, a DSLAM (Digital Subscriber Line Access Multiplexer) is essential on the provider's end to connect multiple customer DSL lines to a high-speed backbone network.
While a router is often used in home networks to distribute the internet connection to multiple devices, it is not a minimum requirement for an xDSL circuit itself, as a single computer could be connected directly to the modem. Therefore, the correct answers are: