The Coulomb Constant $\mathrm{k}$ Has a Value Of $8.99 \times 10^{9} \mathrm{~N} \cdot \mathrm{m}^{2} / \mathrm{C}^{2}$

The Coulomb constant $\mathrm{k}$ has a value of $8.99 \times 10^{9} \mathrm{~N} \cdot \mathrm{m}^{2} / \mathrm{C}^{2}$ . The permittivity of vacuum $\varepsilon_{0}$ has the units

A) $\mathrm{C} 2 /\left(\mathrm{N} \cdot \mathrm{m}^{2}\right)$ .
B) $\mathrm{C} /(\mathrm{N} \cdot \mathrm{m})$ .
C) $\mathrm{N} \cdot \mathrm{m}^{2} / \mathrm{C}^{2}$ .
D) $\mathrm{N} \cdot \mathrm{m} / \mathrm{C}$ .
E) none of the choices are correct.