38.如擔保信用狀內容載明“WE HAVE BEEN INFORMED THAT ABC CO. HAS ENTERED INTO CONTRACT NO. 1234 DATED MAY 5, 2015 WITH YOU, FOR THE SUPPLY OF FOUR SETS OF MACHINE”，依文觀意，請問這是何種型態之擔保信用狀？
(A)投標保證
(B)預付款保證
(C)借款保證
(D)履約保證