Which of the following is a true statement concerning a contract for the sale of goods which contains no express provisions on the passage of title?

a. if delivery is to be made without moving the goods and the seller is to deliver a document of title, title passes at the time and the place the parties entered into their contract. 
b. if delivery is to be made without moving goods that are already identified to the contract and no documents are to be delivered, title will pas when the buyer takes physical possession. 
c. reservation of a security interest by the seller is a retention of title.
d. if the contract requires the seller to deliver the goods at a named destination, title will pass to the buyer on tender there.