You are either doing contract work to extend your existing runway -- you saved up 6 months expenses, and the contract work is what allows you to let the business build for a few extra months (in which case you have a runway and the fourth option applies) -- or doing it to survive the next few months (in which case the last option applies)
Even though I disagree that it's a separate category, I added " You have an existing job and are continuing either full time or part time while you start the business"
My case would be bootstrapping and paying bills through parttime contract work.