问题如下：
MM is a large investment management firm. According to MM firm's policy, new accounts for the purpose of performance calculation can not be added until the first full month of management. Eren, who is in charge of MM's performance calculation, noticed that a large amount of holdings in MM's newly-built account were purchased by TT company, resulting in a significant increase in the returns of MM's investment. The purchase happened before the end of the account's initial month, but Eren decided to include the newly-built account in the performance calculation, so as to produce positive effect on MM's performance. Which of the followings is true?
选项：
A.Eren did not violate the Code and Standards, firms have the power to decide whether and when a new account can be added to their performance calculation.
B.Eren did not violate the Code and Standards, based on the GIPS standards, composites can be updated on the date of large transfer.
C.Eren violated the Code and Standards, adding the new account is not consistent with MM’s stated policy and will produce deviation in the monthly return calculation.
解释：
C is correct.
Based on Standard III(D) Performance Presentations, Eren violated the Code and Standards because adding the new account is not consistent with MM’s stated policy. If the firm wants to change its composite policies, all cash flows for the month need to be reviewed based on new policies so consistent treatment can be applied to them, A is incorrect. MM does not claim to comply with GIPS, moreover, external transfer needs to be treated in a consistent way with the firm’s stated policies under GIPS, B is incorrect.
这个怎么就涉及到III(D)这条了呢？
