If $A$ and $B$ are square matrices of order $2$,then $(A + B)^2 = $

  • A
    $A^2 + 2AB + B^2$
  • B
    $A^2 + AB + BA + B^2$
  • C
    $A^2 + 2BA + B^2$
  • D
    None of these

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