Define what is meant by a tick mark. What is to purpose O A The initials of the auditor adjacent to the audit procedures in the audit program used to indicate who performed the procedures OB. The initials of the auditor on a written statement in the form of a memorandum used to indicate who prepared the statement OC Symbols used on an audit schedule that provide cross references for purposes of organizing and filing D. Symbols used on an audit schedule that provide additional information or details of audit procedures performed An explanation of the tick mark must be included at the bottom of the audit schedule to indicate what was done and who did it