UK: none of the above => not legal
In the UK (well, England anyway) the None of the Above option is explicitly banned, and any organisation or candidate who appears to be standing on such a platform will be blocked, howver reasonable their case may appear to be. This happened to at least two organisations in the last couple of general elections.
See e.g. https://nota-uk.org/
Some might find this interesting too, along similar lines:
https://nota-uk.org/2017/02/02/meet-cambridge-analytica-the-big-data-communications-company-responsible-for-trump-brexit/