Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

Tony Harris is planning to start trading in commodities. He has heard about the use of futures contracts on commodities and is learning more about them. Which of the following is Harris least likely to find associated with a futures contract?
Option A:Existence of counterparty risk.
Option B:Standardized contractual terms.
Option C:Payment of an initial margin to enter into a contract.

Answer: A