Question

what type of infrastructure does dsl use to provide internet service?
fiber optic cables
satellite dishes
telephone lines
cable tv lines

Explanation:

DSL (Digital Subscriber Line) is a technology that uses existing telephone lines to provide internet service. Fiber - optic cables are used for fiber - optic internet (like FTTH - Fiber To The Home). Satellite dishes are used for satellite internet. Cable TV lines are used for cable internet (provided by cable TV companies).

Answer:

Telephone lines