The correct answer is: C. 600
Trolley caution order no. 600 is a safety procedure that must be followed when working with trolleys. It requires that all trolleys be inspected before use, and that they be properly secured when not in use. The order also requires that all personnel be aware of the dangers of trolleys, and
that they take appropriate precautions to avoid accidents.Option A, 400, is the trolley caution order for working with overhead cranes. Option B, 500, is the trolley caution order for working with forklifts. Option D, 800, is the trolley caution order for working with aerial
lifts.It is important to follow all trolley caution orders to ensure the safety of personnel and equipment.