Modification of possession: A means of delivery of a property. When the property right is transferred, the two parties agree that the transferor will continue to own the movable property, and the property right will take effect when the agreement becomes effective. Which of the following is the case of possession modification? ['A sells his bicycle to B. At the same time, the two parties agree that the bicycle will still be used by A until A goes abroad.', "A and B have agreed to sell their computer to B. Because the computer was being used by A's sister at the time of the transaction, A asked B to pick up the computer from his sister.", 'A lent his necklace to B for use. B liked the necklace very much during use, so he paid A a certain amount and bought the necklace.', 'A sells his house to B, but the two parties agree that A will live in the house before A gets a new house.']