There is a uniform electrostatic field in a region. The potential at various points on a small sphere centered at P, in the region, is found to vary between in the limits 589.0 V to 589.8 V. What is the potential at a point on the sphere whose radius vector makes an angle of 60⁰ with the direction of the field

(a) 589.5 V

(b) 589.2 V

(c) 589.4 V

(d) 589.6 V