Aseller owned a large parcel of land. the western half was undeveloped, and the eastern half contained a grove of apple trees. the seller gave a buyer a deed conveying "the western half of the parcel from the western boundary to the grove of apple trees, comprising 220 acres." it was subsequently determined by survey that the land conveyed to the buyer was in fact 229 acres. in a dispute between the seller and the buyer as to the mistake, which of the following is most accurate? a the deed is invalid because of the mutual mistake of the parties. b the deed is invalid unless the court admits parol evidence as to the amount of acreage conveyed. c the deed is valid, and the buyer is the owner of 220 acres. d the deed is valid, and the buyer is the owner of 229 acres.