NO.PZ2016021705000058
问题如下：
If a company’s objective is to support its stock price in the event of a market downturn, it would be advised to authorize:
选项：
A.an open market share repurchase plan to be executed over the next five years.
B.a tender offer share repurchase at a fixed price effective in 30 days.
C.a Dutch auction tender offer effective in 30 days.
解释：
A is correct.
Of the three methods, only an authorized open market share repurchase plan allows the company the flexibility to time share repurchases to coincide with share price declines.
老师，这道题我有两个疑问：1. 看解析的意思是只有A选项最终能在下行市场以低价买入，那B是以溢价到市价这区间的价格来买么？C选项也是以溢价来买，特殊时期是折价，对么？
2.这个30天，定义里也没明确，都是一段时间，怎么讲？
