A vessel has been equipped with an oil lubricated stern bearing and is undergoing a routine dry-dock.Which of the following inspection should be made when the tail-shaft has been drawn?（）
A.The overall condition of the bearing surface should be examined
B.The shaft liner should be inspected for cracks and tested to insure a tight fit
C.The stern tube should be tested for cracks with dye penetrant
D.all of above
