Wilson, a sales representative at a health club, tried selling a $700 membership plan to one of the club's most loyal customers. The customer agreed to purchase the plan at a lesser price of $500. Keeping in mind that the relationship with the customer was important, Wilson agreed to sell it for $650 along with some additional free services. Which of the following negotiation approaches does this scenario best illustrate?

A. Arbitration
B. Distributive bargaining
C. Integrative bargaining
D. Litigation