How many occupation zones were there in Germany after the Second World War?

EDITORIAL LEARNING AID

Why is this answer correct?

In 1945 Germany was divided into four occupation zones: American, British, French and Soviet. Berlin additionally received four sectors. There were never three, five or six occupation zones.

Four zones: USA, USSR, Britain, France.

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