Imaris
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Simultaneously. If you voted, you didn't "not vote."
Okay, I'm answering specifically about the highlighted word: I didn't vote first, then I didn't vote again, then I didn't vote again. Therefore, I can not vote an infinite number of times in any unit of time, different from zero and an infinitely small unit of time. Analogy - an infinite number of points on a line.
Therefore, I can not vote at the moment when I am voting. => I am simultaneously voting and not voting.
Added after 32 seconds
And why are there no options like "I don't know" and "I don't care" in the poll?