Which of the following statements are correct regarding thrombocytes?
$I$ - Also known as blood platelets.
$II$ - They are cell fragments.
$III$ - Produced from megakaryocytes.
$IV$ - Their count in a normal individual ranges from $3,50,000$ to $6,00,000$ per $mm^3$.
$V$ - Involved in the process of blood coagulation.

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