Which coat of arms belongs to the federal state of Lower Saxony?

EDITORIAL LEARNING AID

Why is this answer correct?

The state coat of arms of Lower Saxony shows the white Saxon horse on a red background; picture 3 shows this coat of arms. Pictures 1, 2 and 4 show the coats of arms of other federal states and are therefore wrong.

White horse on red – that is Lower Saxony's coat of arms.

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