How Did Uber Conflict with Carnegie Mellon University's National Robotics

How did Uber conflict with Carnegie Mellon University's National Robotics Engineering Center (NREC) ?

A) Uber promised a large donation to NREC but then reneged on the offer when NREC would not provide Uber with researchers.
B) Uber poached entire NREC research teams with signing bonuses, twice the salaries, and stock options, thereby threatening the future of NREC.
C) Uber allegedly stole ideas from the NREC research team and then claimed that these ideas were generated by their own researchers.
D) Uber bribed NREC officials to give permission for building an extension to the NREC facility that focuses solely on Uber research.