问题如下图：
选项：
A. 
B. 
C. 
解释：
请问一下：
1. 何时disclose presence，use & extent of leverage，derivatives & short positions？a）只要有用到其中之一，就must disclose；如果material，除了disclose，还要include a description of frequency of use & characteristics of instruments. b）must disclose only if material use, also including a description of ...
2. Firms must disclose a description of composite strategy if presenting performance results when advertising. 怎样的一个description才算informative （GIPS-compliant）？麻烦给出一些关键词，例子。
3. Firms must disclose a description / definition of firm (generally). 怎样才算符合标准的呢？本题的description并没有写明，this firm has autonomy over investment decision-making as a distinct business unit （所谓的正统定义），为什么仍然是GIPS-compliant呢？
谢谢！
