Oprah Winfrey has collaborated with several prominent TV personalities, significantly influencing their careers. Dr. Phil McGraw gained fame through his appearances on Oprah's show, later launching his own successful program. Dr. Oz, a frequent guest, became well-known for his health advice, also stemming from his association with Oprah. Rachel Ray, known for her cooking shows, has been featured on Oprah's platform, further boosting her visibility. Each of these relationships highlights Oprah's role in promoting and shaping the careers of these personalities, making "All of the above" the appropriate answer.