प्रमुख लौह और इस्पात संयंत्रों (सूची 1) को उनके संबंधित राज्यों (सूची 2) के साथ सुमेलित करें और सही विकल्प का चयन करें। सूची 1: 1. राउरकेला, 2. भिलाई, 3. दुर्गापुर, 4. विशाखापत्तनम सूची 2: a. पश्चिम बंगाल, b. आंध्र प्रदेश, c. छत्तीसगढ़, d. ओडिशा

Consider the following statements regarding Lösch's Theory of Industrial Location: 1. He disregarded spatial variations in production costs by holding them constant. 2. He treated each function as having a separate range, threshold, and hexagonal hinterland. 3. His theory is also known as the 'Area-Cost Curve Theory'. 4. He used Isocost lines and maps to indicate the optimum location. Select the correct answer using the codes given below:

According to Weber's theory of industrial location, if an industry has a Material Index greater than 1, the most cost-effective location for the industry will be: