Final answer:
A medium-sized business requiring dedicated, symmetric high-speed internet access should opt for a leased line, which enables consistent and high-capacity data transfer.
Step-by-step explanation:
The company should choose a leased line for high-speed internet with dedicated, symmetric access. Unlike DSL, dialup, satellite, or cable modem services that may offer asymmetrical speeds or are not dedicated, a leased line provides a private bidirectional or symmetric telecommunications line between two or more locations with equal upload and download speeds.
Commonly used by businesses for internet access, leased lines are essential for activities requiring consistent and high-capacity data transfer.