The correct answer is halfborn, mallory, and TJ. This can be determined by eliminating the other options. The first option includes X, who is not mentioned in the question. The second option includes John, Alex, and Sam, who are also not mentioned. The fourth option includes Sam, Mallory, X, T.J., and Halfborn, but since X is not mentioned in the question, this option can be eliminated as well. Therefore, the only remaining option is halfborn, mallory, and TJ.