The correct answers are option C and option D
Sodium fluoride is used with other anticoagulants; it is often added to preserve blood glucose. It works by inhibiting an enzyme called enolase, thus inhibiting glycolysis.
Pottasium oxalate is an anti-coagulant; it prevents blood clotting by precipitation of calcium.
Ethylenediaminetetraacetic acid (EDTA) strongly and irreversibly binds calcium ions, preventing blood from clotting.
Heparin is an anti – coagulant that works by lowering the activity of thrombin and factor Xa. It is one of the most commonly used anti – coagulant in the world today.