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Which of the following are the purposes of a groyne as a river training structure ?
1. It contracts a river channel to improve its depth.
2. It protects the river bank.
3. It does not allow silt to deposit in the vicinity.
4. It trains the flow along a certain course.
Select the correct answer using the code given below :



Options:
A .  1 and 2
B .  1, 2 and 3
C .  1 and 3
D .  2, 3 and 4
Answer: Option D



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