Which of the following statements are incorrect in accordance with hydroponics? (i) It determines the mineral nutrients essential for plants. (ii) The hydroponics involves the culture of plants in a soil with defined mineral solution. (iii) Hydroponics requires purified water with non-defined mineral nutrient salts. (iv) In the hydroponics technique, plants are grown in sandy soil with nutrient solution. (v) By this method, essential elements required for the growth of plants can be identified and their deficiency symptoms can also be discovered.

• A. Only (iv)                       
• B.        Only (v)
• C.        Only (iii)                       
• D.        None of the above