The most appropriate action to assess compliance with the organization's standard operating procedures for bank deposits during a preliminary survey is to issue an internal control questionnaire to select branch managers. Branch managers are directly responsible for the day-to-day operations at their branches, including adherence to standard operating procedures for bank deposits. They are in the best position to provide accurate and relevant information about the controls in place and their effectiveness.
IIA Reference:
IIA Standard 2210: Engagement Objectives and IIA Standard 2201: Planning Considerations emphasize the importance of gathering relevant information from knowledgeable sources during the planning phase of an engagement. Issuing ICQs to individuals who oversee the processes under review, such as branch managers, helps in identifying potential risks and areas of non-compliance.