Which of the following is used for telepresence?

A VoIP telephone provides audio communication but lacks the visual component necessary for telepresence.

A webcam captures video of a participant, which is critical for creating a sense of physical presence in a telepresence system by transmitting visual cues like facial expressions and body language. High-definition webcams are often integrated into sophisticated telepresence setups to provide clear and immersive video feeds.

Remote desktop allows control of a computer from another location, focusing on screen sharing and interaction rather than creating a shared physical presence.

A touchscreen is an input method that might be part of a telepresence system's display, but it is not the primary component used for establishing 'telepresence' itself.