The Chief of Staff controls the president’s calendar, limits access to the president, manages the staff, and helps the president in all aspects of domestic and foreign policy.
Option: A
Explanation:
In president's office there are number of staffs to look after the legislation, administration and social welfare related matter. Chief of staff is the person who controls the president’s calendar, limits access to the president, manages the staff, and helps the president in all aspects of domestic and foreign policy.
Staffs handles all the important files, fixed meetings with different parties then finalize all these thing with their chief executive staff. Later he finally convey the important matters to the president.