In interference and diffraction,the light energy is redistributed. If it reduces in one region,producing a dark fringe,it increases in another region,producing a bright fringe. Statement $A$: As there is no gain or loss of energy,these phenomena are consistent with the principle of conservation of energy. Statement $B$: Diffraction and interference are characteristics exhibited only by light waves. Choose the correct answer from the options given below:

• A
  $A$ is false,but $B$ is true
• B
  $A$ is true,but $B$ is false
• C
  $A$ is true and $B$ is also true
• D
  Both $A$ and $B$ are false