About Lighting and reflection of the trailer: which statement is WRONG?

✓ Every trailer must have position lights at the front.
This trailer itself must always have a rear fog light.
White retroreflectors belong at the FRONT; at the rear are red triangular reflectors.
The red TRIANGULAR reflectors belong at the REAR; at the front are white (non-triangular) retroreflectors.

Correct answer: Every trailer must have position lights at the front.

Explanation

White front position lights are required only if the trailer is wider than 1,60 metres. Below that width they are not.

This trailer itself must always have a rear fog light. The only exception is if the TOWING vehicle itself has no fog light. The law does contain a date nuance for older heavy trailers, but the exam follows the book: treat the rear fog light as always mandatory.
White retroreflectors belong at the FRONT; at the rear are red triangular reflectors. Red rear, white front.
The red TRIANGULAR reflectors belong at the REAR; at the front are white (non-triangular) retroreflectors.