UPSC Prelims 2018— Question 15

**Concept and analysis:** India's interoperable ATM network is enabled by the National Payments Corporation of India, which operates payment infrastructure including the National Financial Switch. Interoperability allows customers of one bank to use ATMs of another participating bank under the network's rules. The Indian Banks' Association, NSDL and RBI have different institutional roles and do not themselves constitute the national ATM switching network in the sense asked. The question is testing precise UPSC-level identification rather than a broad association. The key is to distinguish the exact institutional, constitutional, historical, geographical, economic or scientific feature being asked. **Option-wise evaluation** **Option A:** Incorrect. Indian banks’ Association is a different institution, place, definition, proposition or description and does not satisfy the specific requirement of the question. **Option B:** Incorrect. National Securities Depository Limited is a different institution, place, definition, proposition or description and does not satisfy the specific requirement of the question. **Option C:** Correct. National Payments Corporation of India directly matches the concept or factual identification established in the analysis. **Option D:** Incorrect. Reserve Bank of India is a different institution, place, definition, proposition or description and does not satisfy the specific requirement of the question. **UPSC takeaway:** The safest way to solve this type of question is to anchor the answer in the defining feature of the concept and then test every option against that feature. Closely related institutions or terms are often used as distractors. In statement-based questions, do not judge the option as a whole before checking each statement independently. In factual questions, compare the wording of each option with the exact definition, location, institutional role, chronology or scientific property. The correct answer follows from that verification rather than from familiarity with a keyword.