Which of the Following Is NOT an Important Attribute of a Bankers

Which of the following is NOT an important attribute of a bankers' acceptance?

A) makes an unconditional promise to pay the holder of the draft a stated amount on a specified day
B) effectively substitutes its own credit for that of a borrower
C) creates a negotiable instrument that may be freely traded
D) offers the holder a binding agreement to repayment by the exporter if the importer defaults