When you look at a single slit diffraction pattern produced on a screen by light of a single wavelength, you see a bright central fringe and a number of other fringes on either side, their intensity decreasing with distance from the central fringe. if the wavelength of the light is increased:

a. the fringes in the pattern move farther apart
b. the fringes in the pattern move closer together
c. the central fringe gets fainter
d. the outer fringes get fainter and also move farther apart