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Short answer: all three options work, so experiment. James Scott Bell wrote a whole book on how to write from the middle. I haven't read it yet, so I don't know how good the reasons are for doing ...
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Source: https://writers.stackexchange.com/a/36537 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Short answer: all three options work, so experiment. James Scott Bell wrote [a whole book](https://www.amazon.co.uk/Write-Your-Novel-Middle-Approach-ebook/dp/B00IMIXI6U) on how to write from the middle. I haven't read it yet, so I don't know how good the reasons are for doing so, but presumably it's feasible if you know what you're doing. (Of course, you might only do so if you read his book!) I always write from the start, but you can write the end first too. Apparently, J K Rowling started with the ending of the Harry Potter _series_.