Answer:
a. Unity of direction
Explanation:
Unity of direction: In this principle, the direction of work is given by the higher authority with a view to achieving the organizational objective.
Division of work: In this principle, the work is divided between many subordinates/ employees, so that the task should be done in proper time and in an efficient & effective manner.
Scalar chain: This scalar chain represents the rank from high authority to low authority in a straight line so that proper communication/ cooperation can be done without any misunderstanding.
Unity of command: In this principle, the employees are responsible for only one person/ one supervisor/ one commander.
In the given scenario, the unity of direction principle applies as the board of directors wants to establish an independent business so that each domain objective can be achieved so that it becomes to accomplish the organizational objective.