Assertion A : To estimate the rainfall over a catchment, the number of raingauges required per unit area is large for hilly areas.

Reason R : Rainfall gradient is steep.

Select the correct answer according to the coding system given below.

- 1
  
  Both A and R are true and R is the correct explanation of A
- 2
  
  Both A and R are true but R is not the correct explanation of A.
- 3
  
  A is true but R is false
- 4
  
  A is false but R is true

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