If $\alpha = {^m}{C_2}$,then ${^\alpha}{C_2}$ is equal to

  • A
    $^{m+1}{C_4}$
  • B
    $^{m-1}{C_4}$
  • C
    $3 \cdot {^{m+2}}{C_4}$
  • D
    $3 \cdot {^{m+1}}{C_4}$

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