Physics · Electrostatic Potential

What is the electrostatic potential at a distance \( r \) from a point charge \( Q \) located at the origin, assuming the potential at infinity to be zero?

1. A
   \( \frac{Q}{4\pi\varepsilon_0 r^2} \)
2. B
   \( \frac{Q^2}{4\pi\varepsilon_0 r} \)
3. C
   \( \frac{Q}{4\pi\varepsilon_0 r} \)
4. D
   \( \frac{Q}{2\pi\varepsilon_0 r} \)