Vroom Vacuums sells the Tornado vacuum cleaner. Each Tornado has a one-year warranty that covers any product defects. When customers purchase a Tornado, they also have the option to purchase an extended three-year warranty that covers any breakage or maintenance. The extended warranty sells for the same amount regardless of whether it is purchased at the same time as the Tornado or at some other time. How many performance obligations exist in the implied contract for the purchase of a vacuum cleaner?