Which of the Following Is True Regarding How the Obligations

Which of the following is true regarding how the obligations of sellers/lessors and buyers/lessees are determined?

A) Obligations of parties are determined by the terms the parties outline in agreements, but not by custom or rules outlined by the UCC.
B) Obligations of parties are determined by the rules outlined by the UCC, but not by terms the parties outline in agreements or by custom.
C) Obligations of parties are determined by terms the parties outline in agreements and rules outlined by the Uniform Commercial Code, but not by custom.
D) Obligations of parties are determined by the rules outlined by the UCC and by custom, but not by terms the parties outline in agreements.
E) Obligations of parties are determined by the terms the parties outline in agreements, custom, and rules outlined by the UCC.