Sally and Don own a home in Texas. Don loses his job and knows he will be unable to make his mortgage payment. Sally and Don's home is significantly underwater, meaning it is worth less than what they owe on their mortgage. Don knows that if he allows his home to go into foreclosure, he will be helping himself economically while also allowing the mortgage company to retain the property and recoup some of its money off of it. Don convinces Sally that they should just "walk away" from the home and allow it to foreclose. In this scenario, Sally and Don's breach of contract could be considered a(an) ________?

Group of answer choices

waiver

substantial performance

efficient breach

release

partial performance