I like the poll, but the categories aren't comparable.
I'd argue that "real estate flipping" is a job. You apply your skills and effort, and get rewarded for it.
Investing in securities can also be a job, but chances are that most people here just use the stock market to grow the money that they saved performing some other work.
Rental properties can go either way.
If you drop the real estate flipping option, you get a coherent poll regarding passive income strategies. Not sure if that's what you are going for.