Consider the following statements:

$A :$ For beams, l-section are more economical than rectangular sections.

$R :$ Most of the material is concentrated away from the centoid.

Of these statements

- 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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