Final answer:
The WAN technologies that use unshielded twisted pair (UTP) are ISDN, DSL modem, and POTS dial-up modem, because they transmit data through standard telephone lines, whereas cable modem uses coaxial cable.
Step-by-step explanation:
The WAN technologies that use unshielded twisted pair (UTP) are:
- ISDN (Integrated Services Digital Network)
- DSL modem (Digital Subscriber Line)
- POTS dial-up modem (Plain Old Telephone Service)
While ISDN and DSL notably use UTP cables for data and voice transmission, POTS dial-up modems also use UTP as the standard telephone lines, which can carry analog signals for voice and digital signals for data (when using a modem). Cable modem typically relies on coaxial cable, which is why it is not listed among the technologies that use UTP.