______ is a (conditional) bank undertaking of payment. It is a written undertaking by a bank (issuing bank) giving to the beneficiary (usually the seller) at the request, and on the instructions of the applicant (always the buyer) to pay at sight or at a determinable future date up to a stated sum of money, within a prescribed time limit and against stipulated documents or other conditions. A.Documentary credit B. Documentary collection C.D/P D.D/A