Rooney is always hard to tell. He nearly never signed the same way twice, so you hardly have any criteria to tell a good one from a fake. He seems to have signed just as it came to his mind in the second he was signing. That being said I tend to believe in the first one, and I do know that often he used a red pen like in the third example.
KaiMi is right Mickey Rooney did sign differently at different times. This is from an album page that is signed on the back by Jane Alexander from the "Night of 100 Stars" event on February 14, 1982, at Radio City Music Hall. From Jared Gendron (JGAutographs).