The diagram shows four locations in the electric field of a positive point charge. A positively charged particle has vectors perpendicular to the surface and pointing laterally outward. The vectors farther from the surface are shorter. There are 4 dots to the right of the positively charged particle. The closest to the particle is labeled W and the particles further away are labeled X, Y and Z.

At which point is the electric potential the greatest?

W

X

Y

Z