8. The following are requisites of a valid consignation, except: a. Tender of payment by the creditor and refusal without justifiable reason by the creditor to accept it. b. The existence of a valid debt which is due. c. Previous notice of consignation to persons interested in the fulfillment of the obligation. d. Consignation of the thing or sum duc. 9. The following are instances when the loss of thing will not extinguish the liability of the debtor, except? a. When the there is already a delay. b. When the law so provides. c. When the nature of the obligation requires the assumption of risk d. When the obligation to deliver a specific thing arises from a crime. 10. I. The determination of the performance may be left to a third person, whose decision shall not be binding until it has been made known to both contracting parties. 11. Contracting parties may establish such stipulations, clauses, terms and conditions as they may deem convenient, provided they are not contrary to law, morals good customs, public order, or public policy. a. Both statements are true. b. Both statements are false. c. Statement Iis True, statement II is False. d. Statement I is False, statement II is True 11. 1. As a general rule, a party's rights and obligations derived from a contract are not transmissible to the successors. Contracts take effect only between the parties, their assigns, and heirs. II. Debtors are given the right to impugn the contracts of his creditors to defraud them. a. Both statements are true. b. Both statements are false. c. Statement I is True, statement II is False. d. Statement I is False statement II is True 12. I. As a general rule, a person is not bound by the contract of another of which he has no knowledge or to which he has not given his consent