What distinguishes a dedicated line?

A dedicated line is characterized by its provision of a permanent connection typically reserved for a specific user or organization. This means that the line is not shared with others and is always available for the designated use, ensuring consistent and reliable connectivity.

This type of line is often used for applications that require a constant and steady stream of data, such as between office locations or for secure transactions. The permanence of the connection allows for uninterrupted service, making it a critical component in environments where constant communication or data transfer is essential.

Connecting this concept with the other options, a dedicated line is not typically used for mobile communications, nor is it temporary; rather, it represents a long-term installation. Additionally, while dedicated lines can support video calls, they are not limited to that function, making the focus on a consistent and dedicated use the most accurate distinction.