কোন বাক্যটি শুদ্ধ?

অপশনসমূহ
সঠিক উত্তর চিহ্নিত
ক We shall reach the station before the train leaves the station.
খ We will have reached the station before the train leaves the station.
গ We reach the station before the train leaves. before the train leaves the station.
ঘ We shall have reached the station, before the train leaves the station.