A patient with a tumor in the esophagus will receive experimental endoscope treatment. The first procedure requires a thin wire loop with an electric current around the tumor. The second procedure, cryospray ablation, uses extreme cold to freeze tumor tissue with liquid nitrogen spray. The third procedure, radiofrequency ablation, uses high energy radio waves from an electrode that generates heat to destroy esophageal tumors. The cryospray procedure destroyed the tumor. The surgeon believes the electric current loop will destroy the tumor in the esophagus represents a (an):