In which of the following settings would a company be required by the WARN Act to give advanced notice to employees? A company with 4,000 employees plans to lay off 600 people because new equipment has made their jobs obsolete. A company with 600 employees plans to lay off 150 people in an effort to cut costs. A company decides to close a plant which employees 45 people due to decreasing demand. A company chooses to layoff all 300 people who were employed at a plant that was destroyed by fire