The book is published by Addison-Wesley Publishing. You can't invent new options. Doing so will only waste time on the options you have. You can't invent new options. Doing so will only waste time on the options you have.
All options are independent of each other.
If first choice doesn't work go to second, etc. Be careful, most people only pay attention to their first choice believing it will work. You can invent new options. Internet, people, library, etc.