Which of the following is included in the definition of 'Controller' in a business setting?

The primary accountant responsible for financial reporting is correctly identified as a 'Controller' in a business setting because this role encompasses the oversight and management of all financial record-keeping and reporting activities within an organization. A Controller typically ensures that financial statements are accurate and comply with regulatory standards, as well as supervises the accounting department. They play a crucial role in budgeting, forecasting, and financial analysis, making decisions and providing insights that are critical to the financial health of the company.

In contrast, a lead auditor of external financial reviews typically focuses on the examination of financial statements from an independent standpoint, ensuring compliance with accounting standards but does not manage financial reporting internally. The managerial position leading operational audits is associated with internal controls and efficiency rather than direct financial reporting responsibilities. The chief officer of company operations oversees the broader operational functions of the business, which does not specifically include the detailed financial accounting duties that a Controller handles. Thus, the role of the Controller is clearly defined as being centered on financial reporting, making it the most accurate response in this context.