How to determine the type of logic gate by the transfer function?

Question

Electronics

Before that, I asked a question about the transfer characteristics, + - it became clear. Next came the task of determining the levels and type of the logic gate according to the schedule. The graph turned out to be 3d.
Please tell me how to determine the levels according to such a schedule, what to look for and how can you determine the type of valve from the schedule?

Answer 1

if for each input A and B declare that the level "1" is above 2, and "0" is everything else.
then in the example the operation "AND"
Y = ( А>2 ) AND ( B>2 )