The correct answer is: All options are correct.
The duty of care is increased where the probability of injury or seriousness of the risk is high.
If an individual acts in a manner common to the role they are performing or where the act involves some social benefit then these should be taken into account too.
Cost of preventing injury will be taken into account where the cost of prevention far exceeds the risk of injury. Individuals are not expected to cover very high costs to prevent a very low risk.
