Sally goes to have her hair trimmed and agrees to pay $40 to the stylist. While there, Sally decides that she would also like highlights. The stylist informs her that highlights will cost an additional $30. Sally agrees to the price, gets the highlights, but refuses to pay the extra amount. What is the likely result in a dispute between Sally and the stylist, and why?Multiple ChoiceThe stylist will win because she did additional work in exchange for the extra payment; therefore, Sally's promise was supported by valid consideration.The stylist will win because she did additional work in exchange for the extra payment; therefore, a valid unilateral contract existed.The stylist will win unless Sally can show that she had previously received both a trim and highlights for $40. If she can prove that she previously received both for $40, the “past expectations” rule applies.Sally will win because the stylist had a preexisting duty to have her hair looking its finest.Sally will win because there was no valid consideration given in exchange for the highlighting.