A beneficiary presents complying documents to a confirming bank under a documentary credit available by deferred payment.The beneficiary requests that the confirming bank purchase the documents and prepayag ainst its undertaking.In accor dance with UCP600，which of the following may be the correct course（s） of action for the confirming bank？（）

A.Obtain the issuing bank’s agreement prior to paying the beneficiary
B.Refuse the beneficiary’s request while undertaking to pay at maturity
C.Prepay the deferred payment undertaking
D.Obtain an agreement for recourse to the beneficiary