The expected behavior if a prospect refreshes the page after initially submitting the form with the "Always Display Form After Submission" setting enabled is that the form would be displayed on the page once again (B). This setting allows the form to be submitted multiple times by the same prospect, which is useful for fields that are set to always be displayed, such as reporting issues or comments. The prospect would not receive an error message (A), be redirected to a thank-you page , or see the thank-you content (D), as these options are not compatible with the "Always Display Form After Submission" setting. Reference: Account Engagement Form Troubleshooting and FAQ

Explanation
The two actions that can cause an anonymous visitor to convert into an identified prospect are submitting a form on a landing page and clicking on a tracked link in an email. An anonymous visitor is a person who visits your website or interacts with your marketing assets, but whose information you have not captured in Marketing Cloud Account Engagement. An identified prospect is a person whose information you have captured in Marketing Cloud Account Engagement, and whose activities you can track and measure. You can convert an anonymous visitor into an identified prospect by capturing their email address, which is used as the unique identifier for the prospect record. You can capture the email address of an anonymous visitor by:
* Submitting a form on a landing page. A form is a web element that allows you to collect information from your visitors, such as their name, email, or company. A landing page is a web page that you create and host in Marketing Cloud Account Engagement to showcase your products or services, offer content, or register for events. You can add a form to a landing page to capture leads or convert visitors into prospects. When an anonymous visitor submits a form on a landing page, Marketing Cloud Account Engagement will create a new prospect record with the information provided by the visitor, and associate the previous activities of the visitor with the prospect record4.
* Clicking on a tracked link in an email. A tracked link is a link that is modified by Marketing Cloud Account Engagement to track the click activity and redirect the visitor to the original URL. You can use tracked links in your emails, social media posts, or banner ads to measure the engagement of your visitors with your online marketing content. When an anonymous visitor clicks on a tracked link in an email, Marketing Cloud Account Engagement will append the email address of the visitor to the URL, and use it to create a new prospect record or update an existing one. Marketing Cloud Account Engagement will also associate the previous activities of the visitor with the prospect record.

In Engagement Studio programs within Pardot, the paths that prospects take can be defined by various triggers based on their actions or statuses. The following are valid triggers:
List membership: This trigger checks if the prospect belongs to a specific list, allowing for tailored engagements based on list segmentation.
Email open: This monitors whether a prospect has opened an email, serving as a behavioral trigger for further actions.
Custom redirect click: This trigger checks if the prospect has clicked on a custom redirect link, which is often used to track engagement with specific content or calls to action. These triggers help in dynamically steering prospects through different paths based on their interactions with marketing materials.

Explanation
A prospect is automatically removed from future email sends when they either hard bounce or soft bounce five times. A hard bounce occurs when an email is permanently rejected by the recipient's server, usually because the email address is invalid, non-existent, or blocked. A soft bounce occurs when an email is temporarily rejected by the recipient's server, usually because the mailbox is full, the server is down, or the message is too large. A hard bounce indicates that the email address is no longer valid and should be removed from your list. A soft bounce indicates that the email address may still be valid, but there is a temporary issue that prevents the delivery. However, after five soft bounces, Marketing Cloud Account Engagement will mark the prospect as undeliverable and stop sending emails to them

According to the Salesforce documentation, the answer is true. You can see the score, grade, assigned user and recent interaction within the Insight section of the Prospect Record. The Insight section is a feature that shows the key information and metrics of a prospect in Marketing Cloud Account Engagement. The Insight section can be accessed from the Prospects tab in Marketing Cloud Account Engagement, and it can show different data for the prospect, such as score, grade, assigned user, or recent interaction. The score is a numerical value that indicates the level of interest and engagement of a prospect, based on their activities, such as opening an email, clicking a link, or submitting a form. The grade is a letter value that indicates the level of fit of a prospect, based on their attributes, such as industry, job title, location, or company size. The assigned user is the user who is responsible for the prospect, and who can view and edit the prospect's information. The recent interaction is the latest action or event that the prospect has performed or received, such as opening an email, clicking a link, or registering for a webinar. The Insight section can help users to quickly and easily view the most important information and metrics of a prospect, and to take actions based on the data. Reference: Salesforce documentation