Kramer and Biff entered into a formal purchase and sale agreement with respect to Kramer's house. Two weeks later, Biff revisited Kramer and offered to purchase all of Kramer's custom yard and deck furniture too. The price Biff offered was $$2500$ more than the last offer Kramer had received, and he accepted the offer. In these circumstances, if a dispute ensues, will the parol evidence rule play a role?

Select one:

a$.$ it will be used to prevent extrinsic evidence regarding the oral agreement $.$

b$.$ it will not play a role because the oral agreement deals with land and furniture, it is invalid

c$.$ it will be applied to prevent a challenge of the written agreement

d$.$ it will not play a role, owing to the distinct nature of the collateral contract and prive