Definitely solution B. Don't apply any processing to the master (compression, "finalization", EQ, normalization...): just a plain and simple bounce to disk at 24/48k, with no "convert after bounce" or dither on the master fader. Bring at least two CDRs with your mixed material to the mastering house, just in case... I've done lots of mastering for clients, and that procedure is the one that yields the best results. Didier