Assertion $A$ : The maximum bending moment occurs where the shear force is either zero or changes sign.

Reason $R$ : If the shear force diagram line between the two, points is horizontal, the $B M$ diagram line is inclined. But if

the $S F$ diagram is inclined, the $B M$ diagram is a parabola of second degree.

- 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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