Nicola drives the forklift at her place of work- Rooze's Roofing. Nicola always leaves the forklift in a certain place where she has been told to leave it, with the forks up off the ground. One afternoon a customer who is collecting goods from the workshop reverses his car into the forks on the forklift. He is injured and his car is damaged. What is the principle that would make Nicola's employer liable for her actions?

a.Contributory negligence

b.Vicarious liability

c.Strict liability

d.Voluntary assumption of risk