Assertion A: At the critical state of flow, the specific force is a minimum for the given discharge.

Reason R: For a minimum value of the specific force, the first derivative of force with respect to depth should be unity.

- 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 a correct explanation of A
- 3
  
  A is true but R is false
- 4
  
  A is false but R is true

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