The full form of the infectious disease SARS is Severe Acute Respiratory Syndrome. Option 1, Syndrome Associated with Respiratory Symptoms, is partially correct as SARS does involve respiratory symptoms, but it doesn`t capture the severity of the disease. Option 3, Severe Asthmatic Respiratory Syndrome, is incorrect as SARS is not specifically related to asthma. Option 4, Syndrome Alarm on Respiratory System, is also incorrect as it doesn`t accurately describe the disease. The correct full form of SARS is Severe Acute Respiratory Syndrome, which accurately conveys the seriousness and respiratory nature of the disease.