When using A/B and multivariate testing, which email element will require the most effort to test? By vmartinez When using A/B and multivariate testing, which email element will require the most effort to test? Content, copy, and images CTAs Frequency and timing Subject lines Related content Related questions:If you’re running a multivariate ad test, to test…Maria finds that Helsinki is the strongest location…True or false? When you conduct email A/B testing…Which of the following is NOT an element of manual…