Compensation Definition for Schedule C Employee

We have a 1 person Cash Balance Plan (owner only) that we are taking over.  I just want to make sure that they have compensation defined correctly in the Plan Document.  The choices given are:

1) W2
2) Code 3401
3) Code 415 Safe Harbor

Thanks in advance!

Check the BPD - it should say that for a self-employed individual their compensation is their net earned income from self-employment, so whatever AA option gets checked I don't think it matters much.