The average annual salary of Hongda's management staff is 200,000 yuan, while the average annual salary of the sales staff is 180,000 yuan, and the average annual salary of all employees of the company is 120,000 yuan. If the above information is correct, which of the following conclusions can be drawn? ['At least one employee has an annual salary lower than the average annual salary of the salesperson.', 'No salesperson has a higher annual salary than a manager.', "At least half of the managers' annual salary is higher than the average annual salary of the sales staff.", 'HTC has fewer managers than sales staff.']