Question: Fill in the blank: When performing email A/B tests, _______.
- testing one variable at a time is recommended, because segmentation renders multivariate testing impossible
- testing one variable at a time is recommended, because it allows you to isolate the effect of each variable
- testing multiple variables at a time is recommended, because it allows you to view a range of effects and possibilities in your email marketing
- testing multiple variables at a time is recommended, because it allows you to isolate the effect of each variable
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