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I can express slight approval (and not a strong endorsement) of only one of them ("This theory is rapidly verifiable").
BTW, a Web search turned up only two instances of "rapidly verifiable", but 1,930 instances of "readily verifiable". I recommend "readily verifiable" as more easily understood.
The last one's syntax seems out whack, the second one doesn't make much, therefore the first one would be the most correct. Though, out context, as these are, they all seem a little funky.
verifiable 
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