fill in the blank: When using A/B testing for email, it’s important to ____.

1. remember that A/B testing is only useful for larger organizations and isn’t useful until your company reaches a certain scale
2. test only one thing at a time so you can isolate the significant variable
3. never conduct an A/B test on more than 50 people, since your hypothesis might be wrong
4. test more than one thing to take advantage of the experiment

Correct Answer:
test only one thing at a time so you can isolate the significant variable