问题如下：
Wang is a junior credit strategist. He is discussing the top-down approach and bottom-up approach with his supervisor.
Wang made the following statements:
Statement 1: A top-down approach to sector allocation is largely based on a portfolio manager’s macro views
Statement 2: The key aspect of the bottom-up approach to credit strategy is assessing the relative value of individual bonds or issuers.
Statement 3: In the top-down approach, the investor generally has conducted extensive research on companies within the industries.
According to the information above, which of the following is correct?
选项：
A.Statement 1 and Statement 3 are correct
B.Statement 1 is correct; Statement 2 is correct
C.Statement 2 and statement 3 are wrong
解释：
答案：B is correct.
考点：Top-down和Bottom-up方法的比较
解析：Statement 1和Statement 2正确，为原版书给定结论。Statement 3错误，Statement 3描述的情况属于Bottom-up的情况。
S3中行业研究为什么属于bottom-up? 我记得在Equity科目中，sector selection属于的是Top-Down
