When auditing a financial process, an IS auditor should primarily focus on:

Focusing on identifying the completeness and accuracy of transactions is vital for an IS auditor during a financial process audit. This aspect ensures that all financial data recorded in the system represents actual transactions that occurred and are recorded without errors. Completeness addresses whether all necessary transactions have been captured, preventing the risk of omitting or overlooking significant financial activities, which could lead to inaccurate financial statements. Accuracy ensures that the recorded data reflects the true nature and value of those transactions, which is essential for maintaining the integrity of financial reporting.

In this context, while minimizing costs, correcting deficiencies, and verifying compliance with statutory requirements are important aspects of the audit process, they do not hold the same primary focus when assessing the reliability of financial data. The primary concern remains the integrity of the transactions themselves, as this directly influences the financial statements and the overall trustworthiness of the organization's financial reporting.