Which of the following is/are TRUE regarding lashing requirements to secure vehicles aboard Ro-Ro vessels? （）

A. The securing of cargo on flats and trailers and in containers must be adequate to withstand both road and sea motions
B. The generally recommended lash angle cannot be greater than 45 degrees relative to the deck inany direction
C. It is necessary for an adequate number of securing points on the vehicles themselves in order that lashings may be properly and safely utilized
D. All the above