Which type of connector is utilized on the WAN port of a DSL modem?

The WAN port of a DSL modem uses an RJ-11 connector. This type of connector is specifically designed for telephone lines, which is essential for DSL connections as they transmit data over the same copper wires that carry voice signals.

DSL, or Digital Subscriber Line, operates over the existing telephone network, and the RJ-11 jack connects the modem to the telephone wall outlet. This is crucial for the modem to establish a connection with the Internet service provider using the DSL technology.

Other options, while useful for different applications, do not apply in this scenario. For instance, RJ-45 connectors are primarily used for Ethernet networking and look similar to RJ-11 but are larger and intended for use with networks rather than telephone lines. USB-C connectors are generally used for data transfer and charging devices, and HDMI connectors are for audio and video output. Hence, the RJ-11 is the correct and only appropriate choice for the WAN port of a DSL modem.