correct ink level in a damper?

[Forty One]

I've scrounged the internet but I can't get a definitive answer.
Is it closer to A or B?

 

[cornholio]

A is enough.

 

[Solventinkjet]

A is what it should look like but I've seen many with less ink in it and still work. When it's full like that on the right it can indicate that you're using a bulk system that doesn't use mid cartridges or there might be a small air leak somewhere throwing off the pressure.