Explanation
Email deliverability is the measure of how successfully your emails reach the inbox of your recipients without bouncing or being marked as spam. Email deliverability depends on several factors, such as your sender reputation, your email content, and your email authentication. Two of the most important email authentication methods are Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM). SPF is a protocol that allows you to specify which IP addresses are authorized to send emails from your domain. DKIM is a protocol that allows you to digitally sign your emails with a private key and verify them with a public key published in your domain's DNS records. Both SPF and DKIM help prevent email spoofing and phishing, and improve your sender reputation and deliverability

Explanation
According to the Salesforce documentation, the default scoring model in Marketing Cloud Account Engagement assigns points to prospects based on their activities, such as clicking a link in an email, submitting a form, or visiting a landing page. These activities indicate the level of interest and engagement of the prospects, and help prioritize them for sales follow-up. Converting a lead to a contact or sending an email to the assigned user are not activities that automatically increase the prospect's score, unless they are customized in the scoring rules. References: Salesforce documentation

Explanation
Opportunities in Salesforce must be tied to a contact syncing with Marketing Cloud Account Engagement for them to be created in Marketing Cloud Account Engagement. This means that the opportunity must have at least one contact role in Salesforce, and that contact must be syncing with a prospect in Marketing Cloud Account Engagement. If the opportunity does not have any contact roles, or the contact is not syncing with Marketing Cloud Account Engagement, the opportunity will not be created in Marketing Cloud Account Engagement. This is because Marketing Cloud Account Engagement needs a prospect to associate the opportunity with, and the contact role is the link between the opportunity and the prospect. For more details
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Explanation
Form reports show the performance and activity of your Marketing Cloud Account Engagement forms, which are web forms that capture prospect information. You can use form reports to see how many prospects have viewed, completed, or started but not completed your forms, as well as the conversion rate and average time to complete. You can also drill down into individual form submissions and view the prospect's details and activities. References: [Form Reports], [View Form Reports]

Explanation
The step type that should be used in engagement studio if a user wants to branch prospects down two paths based on actions taken on a marketing asset is a trigger. A trigger is a step type that checks the behavior of the prospects, such as opening an email, clicking a link, submitting a form, etc. A trigger can branch the program based on whether the prospect has completed the behavior or not. For example, a trigger can check if the prospect has clicked on a link in an email and send them different emails accordingly. A rule is a step type that checks the criteria of the prospects, such as field values, list membership, tags, etc. A rule can branch the program based on whether the prospect meets the criteria or not. A wait is a step type that pauses the program for a period of time before executing the next step. A wait does not branch the program. An action is a step type that performs a certain action on the prospects, such as sending an email, adding to a list, changing a field value, etc. An action does not branch the program. References Engagement Studio: Step Types