An internal auditor is examining the organization's internal control processes.

An internal auditor's primary role is to evaluate and improve the effectiveness of risk management, control, and governance processes. To test the reliability of a customer database, the auditor would focus on identifying potential issues that could affect the accuracy and completeness of the data. This involves reviewing records, reports, and conducting data analysis to identify anomalies, inconsistencies, or patterns that suggest problems with the data. This step directly assesses the reliability of the database, which is crucial for ensuring that the information is accurate and reliable.