Which of the following is independent of the choice of coordinate system?

  • A
    $\vec{P} + \vec{Q} + \vec{R}$
  • B
    $({P_x} + {Q_x} + {R_x})\hat{i}$
  • C
    ${P_x}\hat{i} + {Q_y}\hat{j} + {R_z}\hat{k}$
  • D
    None of these

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