A 64-year-old male patient complains of a cold left foot and cramping pain in his left calf and buttock when walking. He also states that he is impotent. Examination reveals a weak femoral pulse on the left side and nonpalpable pulses at the popliteal and pedal arteries. It is most likely that an occlusion has occurred in which of the following arteries? 1) Deep femoral 2) Superficial femoral 3) Common femoral 4) Common iliac