The more important question is how to get through the meeting - they clearly think you did something wrong, and going in there with the regs saying you are right, even if it is true, is unlikely going to help...
I'd try to find out exactly what they think you did wrong... The student did it over a village, saying you told him it was ok? --> Admit you didn't teach him properly only to do that over wide open spaces, won't happen again.
Is it that you violated some internal rule? --> Fess up overlooking it, forgot OPS rule when reviewing the FAR, grovel, won't happen again...
Sorry, I know this sounds patronising (um, patronizing), I don't mean it that way... the more you know before you go into the meeting, the better you can prepare...
[Edit: Just saw Genghis said pretty much the same...]