Which type of internet access is primarily reliant on geostationary satellites?

Satellite Internet is the type of internet access primarily reliant on geostationary satellites. This form of internet connectivity utilizes satellites positioned in geostationary orbit, approximately 22,236 miles above the Earth. This positioning allows the satellites to remain fixed in relation to a specific point on the Earth's surface, which is essential for providing consistent and reliable access to broadband services.

In the case of Satellite Internet, user dish antennas are deployed at homes or businesses, establishing a two-way communication link with the satellite. This setup allows users to access the Internet and transmit data back to the server in a manner similar to how traditional cable or DSL services work, albeit with an inherent latency due to the long distances data must travel to and from the satellite.

The other options represent different technologies. Wireless Internet Service Providers (WISP) use radio waves to deliver internet service, often in rural areas. Fiber optic connections rely on light signals through glass fibers to provide high-speed internet access. Dial-up connects users to the internet through standard phone lines, offering significantly slower speeds compared to satellite service. Thus, Satellite Internet distinctly utilizes geostationary satellites for its operations, making it the correct response in this context.