If we are driving during the day with thick fog, what lights must we have on as a minimum?

If we are driving during the day with thick fog, what lights must we have on as a minimum?
A)Low-beam or high-beam lights.
B)Rear fog lights and low-beam lights.Correct
C)Rear and front fog lights plus the low-beam lighting.
FRONT FOG LIGHT:
- Its installation and use is NOT mandatory.
- It will be white or selective yellow.
- It will be used, voluntarily, in the case of fog, heavy rain, snow, clouds of smoke or dust or in circumstances similar to the above.
- It can also be used on narrow roads with many curves, that is, those that having a roadway of 6.5 m wide or less, are signposted with «dangerous curves» signs.
REAR FOG LIGHT:
- Its installation and use is mandatory.
- It will be red.
- It will be used, mandatorily, in case of THICK fog, VERY heavy rain, HEAVY snowfall or DENSE clouds of smoke or dust.
In the case of the question, since it is thick fog, we must mandatorily have the rear fog light and the low-beam or dipped beam lights on. The front fog light, since its installation is optional, its use will also be optional.