The electric potential at a point certain distance from a point charge is 600 V and the electric field is 200 NC^-1. Which of the following statements will be true? 

The magnitude of the charge is $20\times {10}^{-3}\mathrm{C}$

The distance of the given point from the charge is 3 m.

The potential at a distance of 9 m will be 200 V.

The work done by an external agent in moving a point charge of 1 mC from the given point to a point at a distance of 9 m will be $4\times {10}^{-4}\mathrm{J}$.