Given below are two statements: Based on them,select the correct option.
Statement $I$: Activated sludge is obtained in the grit chamber.
Statement $II$: Activated sludge is pumped into an anaerobic digester.

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