What is the SI unit of absolute permittivity of a medium?

• A. \(\frac{J}{C}\)
• B. \(\frac{{{C^2}}}{{\left( {N{m^2}} \right)}}\)
• C. \(\frac{{{C^2}}}{{\left( {Nm} \right)}}\)
• D. \(\frac{{\left( {Nm} \right)}}{{{C^2}}}\)