Answer:. a. You never show any symptoms of disease and there is no sign of the pathogen in your body.
Explanation: To be infected of a disease is to be affected by a disease causing organism.
For an individual to be infected there will be a sign and or symptom of the infection in the body but it could either be supressed by medication,or show obviously effect in such individual or mild effect. Hence an exception is a) where there is no symptom is shown and no sign of pathogen in the body.