If the sides of a regular hexagon $ABCDEF$ are given by $\vec{AB} = \bar{a}$ and $\vec{BC} = \bar{b}$,then $\vec{FA} = .....$

  • A
    $\bar{b} - \bar{a}$
  • B
    $\bar{a} - \bar{b}$
  • C
    $\bar{a} + \bar{b}$
  • D
    None of these

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