What items must be prepared in tray 1 outside of the room?

The correct choice pertains to the essential items that need to be organized prior to entering the treatment area. Preparing X-rays, bitewing tabs, and new film in tray 1 outside of the room is crucial for maintaining a sterile environment and minimizing cross-contamination. This preparation ensures efficiency during the radiographic procedure, as everything necessary for the X-ray process is readily available when the dental professional enters the treatment area.

By preparing these specific items outside the room, the risk of introducing contaminants into the clinical environment is significantly reduced. Additionally, it supports infection control protocols, as having all radiographic materials prepped in advance helps streamline the workflow and adheres to best practices in infection prevention. Other items listed, while important, do not have the same critical need for preparation outside the clinical area concerning maintaining sterilization and workflow efficiency.