I don't really know much about DirectX other than it is responsible of having better graphic options for games, for example, tessellation and Ambient Occlusion in DX11.
But my question is, why some games (most recent games I've played at least), have the option of choosing DX9 (default) or DX 11 (with advanced options, and obviously with compatible video cards), but there is NO option for DX 10?
Is DX10 a version that never got released? was it defective? or what about it? why those games don't show an option to use DX 10 along DX 9 and 11?
Are there ANY games that show those 3 options? or do they just 'jump' from DX 9 directly to 11? why?