The objection will specify in detail all grounds for withholding any record(s) or portion(s) of the record(s) upon which disclosure is opposed under any exemption of the FOIA. In particular, if the submitter is asserting that the record is protected under Exemption 4, 5 U.S.C. 552(b)(4), it must show why the information is a trade secret or commercial or financial information that is privileged or