Which of the following statements regarding the clotting of blood in humans are correct ?

  1. Heparin, produced by liver prevents blood from clotting inside the body.
  2. Vitamin K helps in blood clotting.
  3. Chelating Agents such as Sodium/Potassium Oxalate are used in blood banks to prevent clotting.
  4. Thalassemia is the condition where human blood takes abnormally long time to clot.
[A] 1, 2 & 4
[B] 1, 3 & 4
[C] 1, 2 & 3
[D] 2, 3 & 4
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