records that the administrator requires that an investment adviser retain can: a only be kept in written form in a fire-proof safe that is accessible to the administrator for possible review b be kept on electronic media as long as the media cannot be altered and a duplicate copy is kept in a separate location c be destroyed if there is no request from the administrator to review the documents within 2 years of their creation d be retained in any manner that the ria chooses, as long as the integrity of the records will not be compromised