Documentation of a software package is normally produced for two purposes.One is to explain the(1)of the software and describe how to use them.This is known as (2)because it is designed to be read by the user of the software.The other purpose of documentation is to describe the software's intemal composition so that thesystem can be maintained later in its life cycle.Documentation of this type is known as(3)

空白（1）为（）

A.plans

B.cost

C.features

D.schedules

重新启动站控机时，首先关闭工程软件和（）程序，然后按照重启步骤进行操作。