a. If an item states that it is "payable through" a bank identified in the item, the item designates the bank as a collecting bank and does not by itself authorize the bank to pay the item, and the item may be presented for payment only by or through the bank.
b. If an item states that it is "payable at" a bank identified in the item, the item is equivalent to a draft drawn on the bank.
c. If a draft names a nonbank drawee and it is unclear whether a bank named in the draft is a co-drawee or a collecting bank, the bank is a collecting bank.