Final answer:
To identify cases for the trauma registry, the disease index should be queried.
Step-by-step explanation:
Option 2 is correct
To identify cases to be entered into the trauma registry, the Disease index should be queried. The disease index is a database that contains information on patients' diagnoses and procedures and is used to track and monitor healthcare outcomes. By querying the disease index, healthcare professionals can identify cases that meet the criteria for inclusion in the trauma registry based on specific diagnoses or procedures related to trauma.