I got is wrong because I said "his" name and the answer on my screen was "her" name. And here it says "its" name.
All three of those translations should be accepted. Report it to let the contributors know.
I remember long ago learning the word उसके as opposed to उसका. Is there any difference between these two?
Yes, उसके goes before plural masculine nouns and उसका goes before singular masculine nouns. उसके is also used in the oblique case.