Question $10($Mandatory$)(2$ points$)$

Which of the following constitutes a mutual mistake of a material fact that allows the parties to avoid the contract?

Bert buying a computer from Oscar without asking any questions or testing if it works

Bert agreeing to lease a house to Oscar but Bert thinks Oscar wants to lease his $2-$story house but Oscar thinks he is renting a different $3-$story house.

Oscar selling his iPhone to Bert and Bert doesn't know how to use an iPhone because he has always an an Android phone

Bert selling Oscar a toy car for $$1,$ both of them unaware that it is a valuable collectible worth $$1000$