Brice owns a parcel of land that is encumbered by a mortgage held by the First National Bank. Brice agrees to sell the land to Paul for $50,000. Brice and Paul together go to the First National Bank to discuss the sale and purchase with the banker. Brice, Paul, and the banker sign an agreement stating that Paul will assume the mortgage and that Brice will be discharged from all further liability on the mortgage. In this case: