What type of investigation may be conducted by a manufacturer regarding purchasing violations?

The manufacturer audit is the correct choice for the type of investigation a manufacturer may conduct regarding purchasing violations. This type of audit is specifically designed to assess and evaluate the processes and procedures used by the manufacturer in relation to purchasing practices, particularly to ensure adherence to regulatory requirements and program compliance, such as those outlined in the 340B Program.

A manufacturer audit typically involves a thorough review of documentation, interviews with personnel, and examination of purchasing patterns to identify any discrepancies or violations of the purchasing rules. It helps manufacturers gain insights into their compliance status and determine whether corrective actions are needed to address any potential issues.

In this context, while other types of audits exist, they do not specifically target purchasing violations in the manner that a manufacturer audit does. For instance, a quality audit focuses on the quality of products and services rather than on compliance with purchasing regulations, a compliance review is broader and might not exclusively address purchasing practices, and a performance evaluation generally assesses the effectiveness or efficiency of operations rather than specific regulatory adherence. Therefore, the manufacturer audit is the most appropriate and specialized form of investigation for addressing purchasing violations.