Which driver has stopped correctly?

Explanation

The blue sign 5.26 ends a place marked with sign 5.25, where the built-up area rules did not apply on this road either. Stopping on the left is allowed only where those rules apply, so A and B on the left stand wrongly, before and after the sign alike, while C on the right shoulder stands correctly (Rules, points 78 and 79; signs 5.25 and 5.26).