Read the following statements regarding Mesosomes:
$I -$ They are in the form of vesicles,tubules,and lamellae.
$II -$ They are formed by the extensions of the cell wall.
$III -$ They help in increasing the enzymatic content.
$IV -$ They are associated with respiration and secretory processes.
Which of the following options is correct for Mesosomes?

• A
  $I, II, III, IV$
• B
  $I, III, IV$
• C
  $I, IV$
• D
  $I, II, IV$