If we encounter this sign, can we continue driving if we have studded tires?

If we encounter this sign, can we continue driving if we have studded tires?
A)No, we must mandatorily fit chains on the drive wheels.
B)Yes.Correct
The sign in the question indicates the obligation not to continue driving without snow chains or other authorized devices, which act on at least one wheel on each side of the same drive axle.
We may continue our journey when we have installed any of the following authorized devices:
- Snow chains.
- Other authorized devices, such as textile covers.
- Winter tires (MS), special for snow and mud.
- Studded tires, which must have rounded edges and not protrude from the surface more than two millimeters.