If the objective of the investigatior is to asasess

If the objective of the investigatior is to asasess the incidence of tuberculosis infection in a community, the most appropriate methodology would be to 

a) Identify all individuals with positive tuberculin test.
b) Perform sputum examination of chest symptomatics.
c) Identify new converters to Tuberculin test.
d) Screen all under-five children with Tuberculin test.

Answer 3