In the electric field due to a point charge q, a test charge is carried from A to the points B, C, D and E lying on the same circle around q. The work done is

the least along AB the least along AD zero along any one of the paths AB, AD, AC and AE the least along AE

zero along any one of the paths AB, AD, AC and AE

The circle ABCDE is an equipotential surface.