$I.$ Photosystem-$I$ is a photosynthetic pigment system located on the appressed part of grana and thylakoids.
$II.$ Photosystem-$II$ is a photosynthetic pigment system located on the non-appressed part of stroma only.
Identify whether the given statements are correct or incorrect and choose the correct option accordingly.

• A
  Statement $I$ is correct,while $II$ is incorrect.
• B
  Statement $II$ is correct,while $I$ is incorrect.
• C
  Both statements are correct.
• D
  Both statements are incorrect.