; or (C) a major United States commercial bank that— (i) is headquartered in the United States; and (ii) holds for the account of others investment assets in a total amount considered by the Maritime Administrator to qualify the bank as a major investment management firm. (4) Qualified guarantee The term qualified guarantee , with respect to a major project, means a guarantee that— (A) is made by one or more persons in connection with a donation for the project of a total amount in cash or securities that the Maritime Administrator determines is sufficient to defray a substantial portion of the total cost of the project; (B) is made to facilitate or expedite the completion of the project in reasonable anticipation that other donors will contribute sufficient funds or other resources in amounts sufficient to pay for completion of the project; (C) is set forth as a written agreement providing that the donor will furnish in cash or securities, in addition to the donor's other gift or gifts for the project, any additional amount that may become necessary for paying the cost of completing the project by reason of a failure to obtain from other donors or sources funds or other resources in amounts sufficient to pay the cost of completing the project; and (D) is accompanied by— (i) an irrevocable and unconditional standby letter of credit for the benefit of the United States Merchant Marine Academy that is in the amount of the guarantee and is issued by a major United States commercial bank; or (ii) a qualified account control agreement. (5) Qualified account control agreement The term qualified account control agreement , with respect to a guarantee of a donor, means an agreement among the donor, the Maritime Administrator, and a major United States investment management firm that— (A) ensures the availability of sufficient funds or other financial resources to pay the amount guaranteed during the period of the guarantee