Which of the following best describes how a president can influence the data in the graphs? Through the role of chief executive officer of the executive branch, the president can determine salary grades of federal employees. A The president has the power to formally introduce appropriations bills in the House of Representatives which can determine salary grades of federal employees. B The president as commander in chief can issue executive orders to modify the salary grades of federal employees. C The president has the authority to issue signing statements to determine the salary grades of federal employees.