Analyze the photo below and answer the question that follows. Graffiti on a wall in front of a row of buildings. Photo by Angr The picture above depicts the Berlin Wall, which divided Berlin in half from the 1960s to 1989. Which type of boundary was the Berlin Wall? A. an Iron Curtain B. a physical barrier C. a trade agreement D. an artistic piece Please select the best answer from the choices provided. A B C D