Nobody knows. You can choose it when you play the game, but it has never been defined in the canon (not even in the new book that tells what happened to him, or so I've heard).
"There is something going on in time and space, and beyond time and space, which, whether we like it or not, spells duty." -Winston Churchill
"For of all sad words of tongue or pen, The saddest are these: 'It might have been!'" -John Whittier
"Apathy is death." -Kreia