Explanation
The Salesforce field type that is unsupported for syncing with Marketing Cloud Account Engagement is Lookup. Lookup fields are fields that allow you to create a relationship between two objects in Salesforce, such as Account and Contact. Marketing Cloud Account Engagement does not support syncing Lookup fields, because they are not compatible with Marketing Cloud Account Engagement's data model and could cause data inconsistencies or errors. Marketing Cloud Account Engagement supports syncing most other Salesforce field types, such as Text, Number, Picklist, and Formula.

Explanation
Completion actions are not retroactive and will only apply to prospects who complete the chosen action moving forward. Completion actions will fire each and every time a prospect takes the chosen action, except for when changing the prospect's Marketing Cloud Account Engagement score

Explanation
An A/B test list send email is a type of email send that allows marketers to test different versions of an email and measure their performance based on metrics such as opens, clicks, and conversions. The winning version is the one that has the highest percentage of the selected metric. If the winning version shows the percentage by which it out-performed the other version as 0%, it means that both versions had the same performance on the selected metric, and the A/B test was a tie2. References: 2: A/B Testing Your Email Sends

Explanation
Completion actions are actions that Marketing Cloud Account Engagement executes after a prospect successfully completes a desired activity, such as submitting a form or clicking a custom link. Completion actions only affect prospects, not visitors, because visitors are anonymous and have not been identified by Marketing Cloud Account Engagement yet

Explanation
The Google Analytics connector allows Marketing Cloud Account Engagement to append UTM parameters to a prospect record. UTM parameters are tags that you can add to the end of a URL to track the source, medium, campaign, term, and content of your web traffic. By connecting Marketing Cloud Account Engagement with Google Analytics, you can automatically add UTM parameters to your Marketing Cloud Account Engagement tracked links and sync them with the prospect records. This allows you to see how your prospects are interacting with your online campaigns and measure their effectiveness