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.

ABC Investment Management acquires a new, very large account with two concentrated positions. The firm’s current policy is to add new accounts for the purpose of performance calculation after the first full month of management. Cupp is responsible for calculating the firm’s performance returns. Before the end of the initial month, Cupp notices that one of the significant holdings of the new accounts is acquired by another company, causing the value of the investment to double. Because of this holding, Cupp decides to account for the new portfolio as of the date of transfer, thereby allowing ABC Investment to reap the positive impact of that month’s portfolio return.
Option A:Cupp did not violate the Code and Standards because the GIPS standards allow composites to be updated on the date of large external cash flows.
Option B:Cupp did not violate the Code and Standards because companies are allowed to determine when to incorporate new accounts into their composite calculation.
Option C:Cupp violated the Code and Standards because the inclusion of the new account produces an inaccurate calculation of the monthly results according to the firm’s stated policies.

Answer: C