Distorted modes are needed for :
1. Rivers 2. Dams across wide rivers 3. Harbours
(a) 1 and 2 only (b) 2 and 3 only (c) 1 and 3 only (d) 1, 2 and 3
1. Rivers 2. Dams across wide rivers 3. Harbours
(a) 1 and 2 only (b) 2 and 3 only (c) 1 and 3 only (d) 1, 2 and 3