Which of the Following Is Not a Usual Source of Implied

Multiple Choice

Which of the following is not a usual source of implied terms?

A) Long established customs in particular types of trades.
B) Long established customs in particular types of transactions.
C) Terms that are reasonably necessary, in accordance with the expectation of the parties, to promote business efficacy.
D) What the parties discussed prior to entering the contract.
E) none of the above