Why is kennedy's repeated claim "ich bin ein berliner" ("i am a berliner") especially effective for his west berlin audience in 1963?

it emphasizes kennedy's belief that communism is only an issue in berlin.

it tells berliners that kennedy will lead the fight against communism.

it demonstrates that kennedy identifies with his audience and supports berliners

in their struggles.

it reminds berliners that the world is watching how they adapt to communism.