Which coat of arms belongs to the federal state of Berlin?

EDITORIAL LEARNING AID

Why is this answer correct?

Image 4 shows the Berlin coat of arms with the upright black bear on a silver shield. The bear has been the city's emblem since the Middle Ages and also appears on the flag. The other images show the coats of arms of other federal states.

The Berlin bear stands upright in the coat of arms.

This translation and explanation are editorial learning aids. The official German wording and answer key govern the examination.