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.

Explanation

Book p.232 - 2 white front position lights are required only if the trailer is wider than 1,60 metres. Below that width they are not.