Explanation
The feature that the Marketing Cloud Account Engagement administrator should use to gather a prospect's company name and job title, but only once they have captured the prospect's first name, last name, and email address in a previous form submission, is progressive profiling. Progressive profiling is a feature that allows the administrator to display different fields on a form based on the information that the prospect has already provided. This way, the administrator can avoid asking the same questions repeatedly and collect more information gradually. Progressive profiling can be enabled on a form by selecting the option "Always display even if previously completed" for the fields that are required, such as first name, last name, and email address, and selecting the option "Only display if progressive profiling is enabled and the field is blank" for the fields that are optional, such as company name and job title. This way, the form will only show the optional fields once the required fields are filled out. Always display even if previously completed, reCaptcha, and dependent fields are not features that can achieve the same goal as progressive profiling. Always display even if previously completed is an option that can be used to enable progressive profiling, but it is not a feature by itself. reCaptcha is a feature that can be used to prevent spam submissions on a form, but it does not affect the fields that are displayed on the form. Dependent fields are fields that are displayed or hidden based on the value of another field, but they do not depend on whether the prospect has already provided the information or not. References Progressive Profiling

When prospects register via a Marketing Cloud Account Engagement form, they will still receive GoToWebinar's reminder and registration emails. This is because Marketing Cloud Account Engagement integrates with GoToWebinar and automatically registers prospects for the webinar when they fill out the form. Marketing Cloud Account Engagement also syncs the attendance and other webinar data with the prospect records. However, Marketing Cloud Account Engagement does not send the webinar emails, which are handled by GoToWebinar.

The engagement dashboard in B2B Marketing Analytics shows the total submissions across all Marketing Cloud Account Engagement landing pages, as well as other metrics such as views, conversion rate, cost per lead, etc. The engagement dashboard helps marketers measure the performance of their marketing campaigns and optimize their content strategy. The pipeline dashboard shows the revenue generated by marketing campaigns, the account-based marketing dashboard shows the engagement and influence of key accounts, and the multi-touch attribution dashboard shows the impact of marketing touchpoints on sales outcomes. Reference B2B Marketing Analytics Overview

The best way to run an A/B test in Marketing Cloud Account Engagement is to set up an A/B test that automatically sends the two versions to a single list and then determines a winner based on clicks or opens. This way, you can compare the performance of the two versions on the same audience and avoid any bias or timing issues that might affect the results. Option A is not a good way to run an A/B test because sending the same list two different emails at different times might skew the results due to factors such as email fatigue, inbox clutter, or changing preferences. Option B is not a good way to run an A/B test because event signups might not be the best metric to measure the effectiveness of an email, especially if the event is not directly related to the email content or offer. Option C is not a good way to run an A/B test because sending the two versions to two different lists might introduce variability in the results due to differences in the list composition, quality, or behavior. Reference: How to Run an A/B Test in Marketing Cloud Account Engagement: A Step by Step Guide (2022), The Basics of A/B Testing in Marketing Cloud Account Engagement - The Spot

Explanation
To see why the email was not sent to the prospect, the marketing manager should refer to the list email send report to see if a suppression list was used. A suppression list is a list of prospects who should not receive a specific email, even if they are on the recipient list. If the prospect was on a suppression list, they would not receive the email. The other options are not likely to explain why the email was not sent, as the prospect was already on the recipient list and was mailable