Consider the following statements: 1. Quantity of seepage in each flow channel of a flow-net is independent of the size of the field. 2. Drop in head between adjacent equipotential lines of a flow net is dependent on upstream head. 3. With increase in the length of a flow path, the corresponding exit gradient will decrease. Which of the above statements are true? a) 1, 2 and 3 b) 1 and 2 only c) 1 and 3 only d) 2 and 3 only