In refererpe to tax research, what is meant by the best possible defensibly correct solution? O A. The best solution for structuring one's affairs so as to minimize the amount of taxes and maximize the after-tax return, knowing that the position will not be challenged upon audit by the IRS O B. The best solution that is advantageous to the client but is based upon substantial authoritative support knowing that the position will not be challenged upon audit by the IRS O c. The best solution for evaluting only nontax implications for completed transaction (e.g., a sale of property), knowing that the position will be challenged upon audit by the IRS D. The best solution that is advantageous to the client but is based upon substantial authoritative support even though the position may be challenged upon audit by the IRS. O