It is I who am right

Source:
http://forum.wordreference.com/threads/it-is-i-me-who-determine-s-how-they-treat-me.494242/
http://www.usingenglish.com/forum/threads/155988-is-the-form-it-s-me-who-am-right-wrong-or-right
http://www.usingenglish.com/forum/threads/154523-WHO