$45.$ A farmer bought a tractor for $$139,000.$ When he was purchasing the tractor the salesman told the farmer "this tractor will meet all your needs $-$ no problem! If you have any problems with this tractor, you can bring it back and we will refund your money!" However, the written contract the farmer signed stated in large letter "this tractor is being sold AS IS$.$ Seller makes no guarantees or warranties of any kind on this used tractor. Buyer may not rely on any oral representations made by any salesperson or agent of seller $....."$ After the farmer had the tractor it had many problems. The dealership refused to take the tractor back or refund the man his money. Which rule of law is involved in this case? $\_\_\_\_\_($Statute of Frauds $/$ Parol Evidence Rule$)$