List-I shows four configurations, each consisting of a pair of ideal electric dipoles. Each dipole has a dipole moment of magnitude p, oriented as marked by arrows in the figures. In all the configurations the dipoles are fixed such that they are at a distance $2 r$ apart along the $x$ direction. The midpoint of the line joining the two dipoles is X . The possible resultant electric fields $\vec{E}$ at X are given in List-II.
Choose the option that describes the correct match between the entries in List-I to those in List-II.