Consider the following statements regarding the vivid geographical aspects of Bihar - 1. Agriculture contributes nearly 67 per cent to Bihar's domestic product. 2. Silk industry in Bihar provides self-employment to over 1,50,000 people 3. About 47 lac acres of land in Bihar get flooded every year, while 10 lac acres remain permanently waterlogged. 4. 85 to 90 percent of Bihar's rural households own less than 5 acres of land each. Which of these statements are correct?