Final answer:
Administering a TB immunization in occupational health nursing is classified as primary prevention.
Step-by-step explanation:
Primary prevention aims to prevent disease before it occurs by reducing exposure or increasing disease resistance. In this case, immunization protects individuals against the initial occurrence of tuberculosis, therefore, the answer to the question is a. Primary. The type of prevention that administering a TB immunization in occupational health nursing is classified as primary prevention. Primary prevention aims to prevent a disease or condition from occurring in the first place by implementing measures before the onset of the disease. In this case, administering a TB immunization to prevent tuberculosis falls under primary prevention.