Just imagine the shenanigans, if an option can be added just before closing:
Yes, we include him in the election poll but, of course, nobody voted for him.
Polls look easy but, unless they are social media click-bait, they do require some planning and consultation.
I have several polls on the go and they all have failings because of unexpected conditions. Mainly they are about software use so the options have to be whittled down based on market research.
Many are annual polls so selecting the options often requires a one month rehearsal in December.
I always provide notes on why options have been chosen and post any ideas for improvement next time.