(A) A method of comparing two versions of a webpage or app against each other
(B) A method only used to compare two versions of an email against each other
(C) A method only used to test subject lines in email
(D) A method only used by inbound professional to measure the success of all emails
This question is a part of the HubSpot Email Marketing Quiz question from Lesson 9. You can check out all the answers to these quiz questions in our HubSpot Email Marketing Quiz Answers page.