The electric field of a dipole at a point on the equatorial plane is _________, where 'p' is the dipole moment and 'r' is the distance of the point from the centre of the dipole and assuming (r >> a) and where '2a' is the distance between the two charges.

• A. -p / (4πϵor3)
• B. -2p / (4πϵor3)
• C. -p / (4πϵor2)
• D. -2p / (4πϵor2)