The correct answer is D) The generally recommended lash angle should not be greater than 45 degrees relative to the deck in any direction. This is correct because the recommended lashing angle for securing vehicles on Ro-Ro vessels is generally no more than 45 degrees relative to the deck. This lash angle helps provide effective securing of the cargo against both road and sea motions, as per international guidelines. The other options are incorrect - A) is false as securing the cargo properly for both road and sea conditions is essential. B) is incorrect as vehicles should be stowed lengthwise rather than athwartships for better stability. C) is also false, as relying only on brakes is not sufficient to prevent vehicle movement on a rolling vessel.