请解析一下A选项

问题如下：

Regarding the GIPS standards, which assertion is correct?

选项：

A.Every client portfolio that incurs fees is mandated to be part of at least one composite grouping.

B.Portfolios sharing identical investment goals are collectively grouped into a single composite.

C.The organization of portfolios into composites relies on their yearly performance outcomes.

解释：

Option B is correct. The GIPS standards stipulate that a composite is formed by combining multiple portfolios that are managed under a unified investment mandate, objective, or strategy. This approach ensures consistency in performance measurement. Option A is incorrect as it is not mandatory for fee-paying non-discretionary portfolios to be included in a composite. Option C is also incorrect, as composites should be determined based on pre-defined criteria rather than post-facto performance, to maintain the integrity of the grouping.