The act of disposition of property refers to an act that directly results in the transfer or elimination of property rights. The result of the disposition of property is the transfer of rights, the reduction or change of the content of the rights, the burden on the rights, and the extinction of rights. According to the above definitions, which of the following acts are not property disposal acts? ["In order to guarantee a debt, Company A mortgaged all its own properties. The mortgage behavior restricted Company A's ownership of the property.", "B abandons his TV. The abandonment makes B's ownership of the TV obsolete.", "C entered into a contract with D to sell C's heirloom ancient paintings, and agreed that C would deliver the ancient paintings after 7 days. The contract made C bear the obligation to transfer the ownership of the ancient paintings after 7 days.", "D forgive C's pecuniary debt, and the forgiveness makes C need not perform his obligation to repay the money."]