Under what condition is the remote control operator relieved from providing protection during movements?

The correct answer is based on the principle that the remote control operator can be relieved from providing protection during movements when the track is confirmed to be clear of obstructions. This condition is critical to ensuring safety in rail operations. When the track is clear, it indicates that there are no physical barriers or hazards that could impede the safe movement of the train. Therefore, the remote control operator can focus on executing movements without needing to continuously provide protection, as the absence of obstructions reduces the risk of accidents or collisions during operations.

In contrast, if the remote control zone is deactivated, or if the switches are not properly lined, or if crew members are positioned outside the zone, these scenarios imply a potential for danger or a lack of proper operational procedure that necessitates continued vigilance and protection by the remote control operator. Hence, the assurance of a clear track is the main factor that allows for the removal of protection responsibilities.