Which of the following bond-line structures are of the same compound? 
Definitions:
FOB
An incoterm meaning "Free on Board," which indicates that the seller is responsible for goods until they are loaded on a shipping vessel, at which point the responsibility shifts to the buyer.
Shipping Term
A term used in contracts to specify the responsibilities of buyers and sellers regarding the transportation of goods.
Common-Carrier Delivery Contracts
Agreements between an individual or company and a carrier, regulated by government agencies, concerning the transport of goods or passengers for a fee.
Destination Contracts
Contracts specifying that the seller will bear the risk and expense until the goods are delivered to a specific location.
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