问题如下图：
选项：
A. 
B. 
C. 
解释：
discretionary portfolios 的概念可否帮忙解释，加深一下理解
NO.PZ2016032802000024 have all no-fee-paying portfolios. a all fee-paying anscretionary portfolios whiapply to the same strategy, mante, or investment objective. C is correct. Accorng to GIPS, a composite must termine the portfolios aebefore the composite's performancalculation. Anall fee-paying anscretionary portfolios shoulincluin the composite whihave the same strategy, mante, or investment objective.谢谢助教～～～～～～
NO.PZ2016032802000024 我当时没有选C，是认为composite需要有同样的策略，目标，mante 题干里说的是portfolio, 这样会不会有些不严谨，因为portfolio 是包含在composite里面。每个公司有很多portfolio和composite。 这样一来就是所有的都是同样的策略，目标，mante
have all no-fee-paying portfolios. a all fee-paying anscretionary portfolios whiapply to the same strategy, mante, or investment objective. C is correct. Accorng to GIPS, a composite must termine the portfolios aebefore the composite's performancalculation. Anall fee-paying anscretionary portfolios shoulincluin the composite whihave the same strategy, mante, or investment objective. C少了Non-screntionary，所以不准确吧
不是说不用付钱的可以不加吗？为什么还选择第三个？
