Which of the following is accurate regarding facial and shoulder lighting measurements in a TelePresence environment? (Select the best answer.)

Facial lighting in a TelePresence room must fall in the 200-400 lux range to ensure participants are evenly lit on camera. Indirect (diffuse) lighting is required to prevent harsh shadows on the face, and the endpoint must be powered off during measurement so the display panel's own light output does not inflate the lux reading.

This option incorrectly identifies the measurement target as general room lighting rather than facial lighting, and specifies direct lighting, which Cisco guidelines explicitly avoid for TelePresence due to shadow and glare issues.

Direct lighting aimed at participants is not recommended in TelePresence environments because it produces harsh shadows and hotspots; indirect, diffuse lighting is the correct approach for facial illumination.

Shoulder lighting is not the reference measurement category defined in Cisco TelePresence lighting specifications for the 200-400 lux range, and facial lighting is the correct measurement point.

Shoulder lighting using direct lighting with the endpoint on conflicts with Cisco guidelines on two counts - the measurement location should be facial, and direct lighting with the endpoint active introduces measurement inaccuracies.

Room lighting is not the specific measurement target in the Cisco facial lighting guideline; the standard applies to facial illumination, not overall ambient room lighting levels.