The cable used for very-high-bit-rate digital subscriber line technology is:

The cable used for very-high-bit-rate digital subscriber line (VDSL) technology is typically a twisted pair copper wire. This type of cable is commonly used in telecommunications because it is capable of transmitting high-speed data over long distances.

Here are the steps to answer your question:

1. Identify the technology in question: In this case, it's very-high-bit-rate digital subscriber line (VDSL) technology.

2. Understand what VDSL is: VDSL is a type of digital subscriber line (DSL) technology that provides faster data transmission over copper telephone lines compared to traditional ADSL connections.

3. Identify the type of cable used: VDSL technology typically uses twisted pair copper wire. This type of cable is made up of two conductors that are twisted together to cancel out electromagnetic interference.

4. Confirm the answer: Therefore, the cable used for VDSL technology is a twisted pair copper wire.