38.開發擔保信用狀或銀行保證承諾 「to pay on demand or at sight against presentation of the documents as may be required」其意係指下列何者？
(A)開狀銀行僅負 Secondary obligation
(B)開狀銀行得以申請人倒閉為由拒付
(C)開狀銀行憑受益人提示擔保信用狀或保證函所要求之單據依規定付款
(D)受益人須提示法院所出其委任人違約或不予付款的證明，開狀銀行始付款