Final answer:
All of the mentioned incidents/accidents (serious injury incidents, lost time injuries and illnesses, and near miss incidents) should be investigated.
Step-by-step explanation:
All of the mentioned incidents/accidents (serious injury incidents, lost time injuries and illnesses, and near miss incidents) should be investigated. This is because each of these incidents can provide valuable insights into workplace safety hazards and preventative measures that need to be taken. By investigating serious injury incidents, organizations can identify the root causes and take corrective actions to prevent similar incidents in the future. Similarly, investigating lost time injuries and illnesses can help identify workplace hazards that require attention, and investigating near miss incidents can help mitigate potential risks before they escalate into more severe outcomes.