NEET Biology question

Which of the following statements are correct? (i) is necessary for blood coagulation. (ii) Coagulation in blood vessel is prevented during normal condition by heparin. (iii) Clotting of blood involves changes of fibrinogen to fibrin by thrombin. (iv) Blood clotting involves cascading process involving a number of factors present always in the active form.

• (A)(i), (iii) and (iv)
• (B)(ii) and (iv)
• (C)(i), (ii) and (iii)Correct
• (D)(iii) and (iv)