12. 假設期望殖利率固定不變，債券愈趨近到期日時，下列敘述何者正確？甲.折價債券價格會趨近債券面額；乙.溢價債券價格會趨近債券面額；丙.溢價債券價格會遠離債券面額 (A)甲與乙正確 (B)甲與丙正確 (C)乙與丙正確 (D)甲、乙及丙都正確