If the use of chains is mandatory, on which wheels must they be installed?

If the use of chains is mandatory, on which wheels must they be installed?
A)On the front wheels always.
B)On the steering wheels.
C)On the drive wheels.Correct
Snow chains or other authorised devices must be installed on the drive wheels, those that receive the power from the engine. The drive wheels can be either the front wheels (front-wheel drive vehicles) or the rear wheels (rear-wheel drive vehicles).