The purpose of unity of command is to ensure:

Unity of command is a fundamental principle in incident management and organization, designed to ensure that there is a clear chain of command and a single point of accountability in any given situation. The correct answer emphasizes that for every specific objective in an incident, there should be one responsible commander. This structure helps prevent confusion and conflicting directions, which can occur when multiple leaders are involved in directing efforts towards a common objective.

Having one responsible commander streamlines decision-making and facilitates effective communication and coordination among team members and resources. This clarity of authority is crucial, especially in emergency situations, as it allows for prompt and decisive action, ultimately leading to more efficient incident management and better outcomes.

Other options suggest approaches like having shared authority or decentralized authority, which can complicate command structure and lead to inefficiencies, especially during critical situations where clear leadership is necessary. The objective of achieving unity of command is to enhance operational effectiveness by establishing clear roles and responsibilities.