题目内容：

[单选题]As an important phase in software development，software design is the continuation of software requirement analysis phase． (69) ．

Ⅰ．software structure

Ⅱ．software document

Ⅲ．software module

Ⅳ．software procedure

Which of the following should be included in software design phase?(69)

A．Ⅱ andⅢ

B．Ⅰ andⅡ

C．Ⅰ，Ⅱ andⅢ

D．All