Richard Plant just signed a major contract to provide landscaping for a new development that is scheduled to open in October 2011. He estimates he needs ten workers for the job, and that the work requires six months of previous experience in landscape or related work. Which of the following is true? Group of answer choices He must file a temporray labor certification with the Department of Labor. He can hire a friend of one of his current workers who has been working without authorization but is a very hard worker. He can hire foreign national without interviewing U.S. workers who applied for the position after advertising it. He must advertise the position