In an experiment, electrons are made to pass through a narrow slit of width $'d' comparable to their de Broglie wavelength. They are detected on a screen at a distance 'D' from the slit (see figure).
Which of the following graphs can be expected to represent the number of electrons 'N' detected as a function of the detector position 'y'\left( {y = 0} \right. corresponds to the middle of the slit\left. \, \right)