On a trailer or a semi-trailer, reflective plates must be installed on the rear wall for safety purposes. Therefore, which of the following statements is correct?

1. AIn a vehicle whose width is more than 200 cm, it is mandatory to install three red/yellow plates.
2. BInstallation of the plates shall be done only at the request of the Licensing Office and in accordance with the instructions of the chief examiner.
3. COne plate of the size 30 cm X 60 cm must be installed in the centre of the rear wall.
4. DIn a vehicle whose width is more than 150 cm, it is mandatory to install two plates: the frame in red and the rest in yellow.

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