What are the units of $K = 1/4\pi {\varepsilon _0}$

  • A

    ${C^2}{N^{ - 1}}{m^{ - 2}}$

  • B

    $N{m^2}{C^{ - 2}}$

  • C

    $N{m^2}{C^2}$

  • D

    Unitless

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