Asserrtion $A$ : Strain is a fundamental behaviour of the material, while the stress is a derived concept.

Reason $R$ : Strain does not have a unit while the stress has a unit.

- 1
  
  Both $A$ and $R$ are true and $R$ is the correct explanation of $A$
- 2
  
  Both $A$ and $R$ are tue 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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