问题如下：
How many of following strategies are least likely to involve industry analysis?
I.Top-down fundamental investing strategy.
II.Sector rotation strategy.
III.Tactical asset allocation strategy.
选项：
A. Only I.
B. Both II and III.
C. Only III.
解释：
C is correct.
Tactical asset allocation strategy refers to timing investments and does not use industry analysis.
请问1是什么。。。。