Which of the following is or are non-structural measures used to mitigate floods? Choose the correct answer from the options given below:

1.Maintaining wetlands.

2.Prevention of over-bank spilling by the construction of embankments and flood walls.

3.Flood forecasting and warning services.

4.Disaster relief, flood fighting and public health measures.

A1 and 2

B1 and 3

C2, 3 and 4

D1, 3 and 4

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