Buster has had a serious medical condition for many months. He has used up all of his sick leave and vacation days, as well as 10 weeks of intermittent Family Medical Leave Act leave. He asks for an additional two weeks off. Which of the following is true? A. Buster's employer can fire him because he wants to take more leave B. Buster cannot be fired for reasons aside from his need to take leave. C. Buster cannot take any more leave if he has also used up his sick leave and vacation days. D. Buster is entitled to the leave he is asking for.