In the experiment of diffraction at a single slit, if the slit width is decreased, the width of the central maximum

• A

  Increases in both Fresnel and Fraunhofer diffraction

• B

  Decreases both in Fresnal and Fraunhofer diffraction 

• C

  Increases in Fresnel diffraction but decreases in Fraunhofer diffraction

• D

   Decreases in Fresnel diffraction but increases is Fraunofer diffraction