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 References:
* 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.

According to IIA guidance, the chief audit executive (CAE) is directly responsible for establishing the objectives, scope, and plan for each engagement. This responsibility ensures that each audit is properly focused and aligned with the overall goals and risk areas of the organization. While maintaining a quality assurance program and providing professional development opportunities are important, they are not solely the CAE's responsibility without management support. Periodic review and approval of the internal audit charter is typically a joint responsibility with senior management and the board. References:
* The IIA's International Standards for the Professional Practice of Internal Auditing (Standards), Standard 2010 - Planning.
* The IIA's Practice Guide on Developing the Internal Audit Plan.

In the "Define IT Universe" stage of the IT audit plan development process, the primary action is to identify significant applications that support the business operations. This step involves mapping out the IT environment, including key systems, applications, and infrastructure components that are critical to achieving business objectives. By identifying these significant applications, auditors can focus on areas that have the greatest impact on the organization's performance and risk profile. This stage sets the groundwork for subsequent steps such as risk assessment, ranking subjects, and selecting audit engagements.
:
IIA Global Technology Audit Guide (GTAG): "Developing the IT Audit Plan" ISACA's COBIT Framework for IT Governance and Management

An The top-down approach to understanding business processes is conducted from a broad organizational perspective, beginning with the overall objectives and strategic goals of the organization and then drilling down into the specific processes that support these goals. While this approach ensures alignment with the organization's objectives, it has the greatest risk of overlooking critical processes at the lower levels, especially those that might be operationally significant but not directly linked to top-level objectives.
IIA References:
* IIA Standard 2010: Planning suggests that internal auditors should understand the organization's business processes in relation to its objectives. The top-down approach aligns with this but can risk missing important operational details that might be captured through a more granular (e.g., bottom-up) approach.

Root cause analysis identifies underlying reasons for control deficiencies or inefficiencies, enabling organizations to address systemic issues and enhance controls. IIA Practice Guide: Root Cause Analysis (2018) highlights its role in promoting continuous improvement. Reperformance (Option A) and vouching (Option B) are audit techniques to verify accuracy but do not diagnose systemic issues. Independent confirmation (Option C) corroborates evidence but does not uncover root causes. Root cause analysis aligns with the CIA Part 2 objective of enhancing organizational efficiency.