regis and maggie just purchased their first home together. the seller offered them a counter offer to their first offer and they were happy with the terms. two months later their basement flooded and cost over $20,000 in repairs to replace all of their household goods and to rebuild the drywall, flooring and mechanical systems. they found out that there was a crack in the foundation that the original owners did not reveal. what type of unethical tactic took place during the purchase agreement?