Given below are two statements.
Statement $I$: Macula densa and $JG$ cells together form the $JG$ apparatus.
Statement $II$: The $JG$ apparatus plays an important role in reabsorption of glucose within kidney.
In the light of above two statements,choose the correct answer from options given below.

• A
  Both statement $I$ and statement $II$ are correct.
• B
  Both statement $I$ and statement $II$ are incorrect.
• C
  Statement $I$ is correct but statement $II$ is incorrect.
• D
  Statement $I$ is incorrect but statement $II$ is correct.