Which of the following is not a reason on why do we collect requirements for creating shell scripts?

What is the missing stage below in Requirements Gathering?

1. Establish project goals and objectives

2. Elicit from stakeholders

3. ?

4. Confirm Requirements

In a Linux Shell script, the hash + bang (#!) has to be on the first line and it tells kernel what shell interpreter to use. Which of the following is an example of a valid hash bang?

In Linux, when you assign a variable there's no need to have a dollar sign character $ whereas when you want to output the variable you have to use the dollar sign character $.

Is it true?