In which case may the original employer not be held liable for an employee's negligent actions?

The correct answer highlights a situation where the original employer may not be held liable for an employee's negligent actions when the employee is borrowing out to another employer. This concept is grounded in the legal doctrine of "vicarious liability," which typically holds employers responsible for the actions of their employees that occur within the scope of their employment.

When an employee is on loan or borrowed to another employer, that person is usually considered the responsibility of the borrowing employer during the period of that work arrangement. Therefore, any negligent actions taken by the employee in the course of work for the borrowing employer would typically fall under their liability rather than the original employer’s. This delineation helps protect the original employer from liability when the employee is performing duties for another organization entirely.

In contrast, scenarios where the employee is under direct supervision, on leave, or when negligence occurs at the workplace typically keep the original employer accountable, as these situations still relate directly to the employee's role and responsibilities with them.