An analyst does research about option moneyness. An investor paid $5 for a put option that was in-the-money $3. If the price of the underlying was $59 at the time the investor purchased the put option, the exercise price of that put option was closest to:

A. $51
B. $56
C. $62

背景

某施工企业承揽一土石坝工程施工任务，并组建了现场项目部。为加快施工进度，该项目部按坝面作业的铺料、整平和压实三个主要工序组建专业施工队施工，并将该坝面分为三个施工段，按施工段1、施工段2、施工段3顺序组织流水作业，并编制了双代号网络进度计划如下图。

问题：

指出水利水电工程施工进度计划主要包括哪些步骤