a: On each frame, that desired object capture, of the animation File: Export: Wavefront Object

b: all information provided by export Wavefront Object as chosen during export options will be stored with said OBJ file. Polygon Groups, Body Part Names, Material Names, UV data etc

I've already described this to you on the technical forum here 

https://www.renderosity.com/forums/comments/4441239/permalink

c: probably FBX. You'll need to test. See the manual.  Simple Bones Single Skin - Interoperable conversion might be something to look into also.

Note that welding might be an issue, depending. I've already explained this to you in the Poser technical forum.

https://www.renderosity.com/forums/comments/4441239/permalink