How Does the Drug Heparin Compare to the Drug Warfarin

How does the drug heparin compare to the drug warfarin?

A) Both heparin and warfarin are based on a partial thromboplastin time (aPTT) value which requires 30 to 45 seconds.
B) Both heparin and warfarin are administered intravenously or subcutaneously.
C) Both heparin and warfarin are anticoagulant drugs.
D) Both heparin and warfarin take same amount of time to reach therapeutic levels.
E) Both heparin and warfarin have bleeding as side effect.