What lights should a driver use in dense fog?

Front and rear fog lights along with dipped headlights.
Front and rear fog lights along with side lights.
Front and rear fog lights along with main beam lights.
Front and rear fog lights along with hazard warning lights.

Explantion: When driving in dense fog you should switch on your front and rear fog lights along with dipped headlights. You should not drive in fog with main beam headlights on.

Theory Tester

What lights should a driver use in dense fog?

Managing Risk