With a white light, at night or when conditions significantly reduce visibility: Correct
When a load overhangs from the front of a vehicle, it must be marked with a white light to make it visible at night or in low-visibility conditions such as fog, heavy rain, or dusk. The light ensures that other road users can clearly see the overhanging load and avoid collisions, especially in situations where visibility is poor. However, reflectants are generally not required for marking the front overhang, making the white light sufficient for these situations.
With a white light both by day and by night: This is incorrect. A white light is typically needed only when visibility is low, such as at night or in reduced visibility conditions. It is not necessary during the daytime when visibility is usually sufficient.
With a white light and white reflectant, at night or when conditions significantly reduce visibility: This option is more comprehensive, as it includes both a light and reflectant. However, the light alone is usually sufficient for marking the overhanging load at night or in poor visibility conditions. The reflectant is typically not mandatory.