What colours does the state flag of Mecklenburg-Vorpommern have?

EDITORIAL LEARNING AID

Why is this answer correct?

The state flag of Mecklenburg-Vorpommern shows the colours blue, white, yellow and red. Black-red-gold is the federal flag, while green-white-red and black-yellow are not state colours.

MV flag: blue, white, yellow, red – Mecklenburg plus Western Pomerania.

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