Which of the following methods has/have been used to estimate poverty in India? 1. Head Count Ratio 2. Calorie intake 3. Household Consumption Expenditure 4. Per Capita Income Select the correct answer from the codes given below. Codes: (a) 2 and 3 (b) 1, 2 and 3 (c) 3 only (d) 1, 2, 3 and 4