Fill in the blanks by using the given expressions.senior managers, chairperson, CEO, president, Board of Directors, managing director, company officersAt the top of the company hierarchy is the ( 1 ), headed by the ( 2 ) or ( 3 ). The board is responsible for policy decisions and strategy. It will usually appoint a ( 4 ) or ( 5 ), who has overall responsibility for the running of the business. ( 6 ) or ( 7 ) head the various departments or functions within the company.