Andrew, a CPA, borrowed money P300,000 from Boyet payable on March 25, 2020. As security for the payment of his loan, Andrew constituted a mortgage on his residential house and lot in Boyet's favor. Fred, who is also a CPA and a good friend of Andrew, guaranteed and obligated himself to pay Boyet, in case Andrew fails to pay his loan at maturity.

1. A) If Andrew fails to pay Boyet his loan on March 25, 2020, can Boyet compel Fred to pay?
2. B) If Andew sells his residential house and lot to Diego, can Basilio foreclose the real estate mortgage?