4. Pedro (principal) authorized Alberto (agent) his sales agent, to sell a house and lot for P3,000,000 cash. Alberto sold the house and lot to Bariving on installment for P3,500,000. What is the right or course of action available to Pedro against Alberto who did not follow the authority given to him? 5. Pepe (principal) writes ABC Supplier Co. that Aurora (agent) is authorized to buy merchandise in behalf of Pepe. Pepe secretly instructs Aurora not to buy from ABC Supplier Co, but merely to obtain the supplier's price list. In violation of said instruction, Aurora bought merchandise from the supplier. Was the action made by Aurora binding between her and Pepe? Please discuss