I am considering using Irrlicht engine. If I do end up using it, what would I have to do when I release the game?

Would I have to 

a)give out the source code

b)put a copyright notice with the game and in the game

c)just put it in the code

d)none of the above

If none of the above, could I just release it without giving credit(I wouldn't do that, but I just want to know what my minimums are when it comes to giving credit when releasing the game).

On 4/16/2019 at 1:54 AM, bioglaze said:

I think this page has all the information you'll need: http://irrlicht.sourceforge.net/?page_id=294

I guess just do t say that I was the one who made irrlicht?