According to the classical Indian School of Logic (Nyāya), which fallacy (hetvābhāsa) is committed in the statement - 'The hill has fire because it is knowable'?

The statement 'a sense organ that perceives a property also perceives the propertyness as well as the absence of that property' can be attributed to which of the following schools of classical Indian Philosophy?

Which of the following Indian thought systems holds that the universal relation (vyapti) in the case of inference (anumana) cannot be determined because there is always room for doubt about unobserved cases?