According to legal standards, when is the use of force justified?

The correct response is based on the understanding that the use of force must align with established legal standards and ethical considerations surrounding the responsibility officers have when caring for individuals. Specifically, when an officer is entrusted with the care of a person, such as in the case of detaining a suspect or overseeing someone in custody, they have a duty to act in the person's best interests. This means that the use of force is justifiable if it is necessary to protect that individual from self-harm or external threats while still acting within the law.

The justification for using force in a scenario where the officer has a duty of care encompasses instances where such force is necessary to ensure the safety of the individual in their custody. This requires careful judgment on the officer's part, prioritizing the preservation of life and welfare.

Other options, while they might seem relevant, don't encapsulate the legal standards as clearly. For instance, while the necessity perceived by an officer holds weight, it alone does not constitute a legal justification without accompanying immediate threats or circumstances that reflect an officer's obligation to protect. In arrest situations, the appropriateness of force correlates more specifically with the immediate threat posed rather than being automatic or assumed as a standard procedure.