NOT a true statement among the following is
All cardiac veins are derived from Coronary sinus with the  exception of Anterior cardiac veins which are derived from primitive atrium.
Coronary Sinus is situated in posterior Coronary sulcus
Coronary Sinus is guarded by Thebesian valve
Middle cardiac Vein runs along with posterior Interventricular artery
All cardiac veins are derived from Coronary sinus