Bull & Cow Corporation, a U$.$S$.$ firm, and Carne Ltd$.,$ an Italian company, contract for a sale of beef. Under a letter of credit issued by Fiscal Bank to facilitate the deal, Carne promises to

a$.$

ascertain whether the seller delivers as contracted.

b$.$

reimburse the bank for the amount paid to the seller.

c$.$

pay the seller when the bank has complied with the terms of the letter.

d$.$

transmit information and expedite payment.