You have diagnosed a Patient clinically as having SLE and ordered 6 tests out of which 4 tests have come positive and 2 are negative.To determine the probability of SLE at this point,you need to know

• A. Prior probability of SLE,sensitivity and specificity of each test
• B. Incidence of SLE and the Predictive value of each test
• C. Incidence and prevalence of SLE
• D. Relative Risk of SLE in the patient