Which statement describes the two types of investigation?

• A. Initial and final
• B. Preliminary and secondary
• C. Formal and informal
• D. Primary and secondary

Answer: (B)

Two stages of an investigation are used here: the preliminary investigation and the secondary investigation. The preliminary investigation is conducted immediately after the incident to quickly determine what happened, which equipment and systems were involved, and to identify obvious hazards so immediate corrective actions can be taken and evidence is preserved for later study. The secondary investigation follows later and digs deeper: it verifies all facts, collects additional evidence, interviews witnesses, reviews logs and procedures, analyzes root causes, and results in a formal report with findings and recommendations to prevent recurrence. This pairing reflects the standard approach for damage control investigations, balancing a fast initial assessment with a thorough follow-up. Other pairings describe different aspects or sequencing, but they don’t match the established two-stage process used in these investigations.