Answer:
D. Mission
Explanation: Mission is a term used to describe the what an organisation is,what it want to achieve as it continues its business. Mission statement is vital to Organisational success as it puts all the departments,and sub units of the Organisation on the same level in terms of what is to be achieved by the Organisation. Mission statement is essential for building unity of purpose and execution of task in the Organisation as all are focused on the MISSION OF THE ORGANISATION.