The threaded joints of the steering wheel are not tightened or secured in the specified manner.
There are no fire extinguishers on the bus.
In both cases.✓الإجابة الصحيحة
الشرح
Steering fasteners must be tightened and secured as specified because looseness can cause a sudden loss of control. A bus must also carry the required fire extinguishers, so both omissions independently prohibit operation.