Statement $(S)$: Using Huygen's eye-piece,measurements can be taken,but they are not correct.
Reason $(R)$: The cross wires,scale,and final image are not magnified proportionately because the image of the object is magnified by two lenses,whereas the cross-wire scale is magnified by one lens only.
Identify the correct one of the following:

• A
  Both $(S)$ and $(R)$ are true,$(R)$ explains $(S)$.
• B
  Both $(S)$ and $(R)$ are true,but $(R)$ cannot explain $(S)$.
• C
  Only $(S)$ is correct,but $(R)$ is wrong.
• D
  Both $(S)$ and $(R)$ are wrong.