Two methods that would accomplish providing access to an eBook once a form has been submitted are using a form completion action to send an autoresponder email with the eBook, and re-directing the prospect to the eBook instead of showing the form's Thank You Content. A form completion action is a way of defining what happens after a prospect submits a form, such as sending an email, adding to a list, or adjusting a score. An autoresponder email is a type of email that is automatically sent to a prospect when they perform a specific action, such as submitting a form. A Thank You Content is a web page that is displayed after a prospect submits a form, such as a confirmation message or a link to a resource. Using a form completion action to initiate an auto-download of the eBook, or including a link to the eBook in the Below Form section of the form are not methods that would accomplish providing access to an eBook once a form has been submitted, as they either involve downloading the eBook before submitting the form, or displaying the link to the eBook before submitting the form4. Reference: 4: [Create a Form]

The fastest way for an Administrator to create a one-time list of prospects who match specific criteria is to use a segmentation rule. A segmentation rule is a rule that runs once and matches prospects based on the criteria you set. You can use a segmentation rule to perform actions on the matched prospects, such as adding them to a list, assigning them to a user, or changing their field values. A segmentation rule is useful when you want to segment your prospects quickly and easily without creating a dynamic list or an automation rule

The scenario in which a prospect would be able to receive the emails in the program is when the prospect is removed from the suppression list. A suppression list is a list that prevents prospects from receiving emails from an engagement studio program, even if they are in the recipient list. A recipient list is a list that defines the prospects who are eligible to receive emails from the program. If a prospect is in both the recipient list and the suppression list, they will not receive any emails from the program. Removing the prospect from the suppression list will allow them to receive the emails, as long as they are still in the recipient list and not opted out. Removing the prospect from the recipient list, marking the prospect as opted out, or removing the prospect from both the suppression list and the recipient list will not allow them to receive the emails from the program. Reference [Engagement Studio Suppression Lists]

A hard bounce refers to an email that permanently bounced back to the sender because the address is invalid. A hard bounce occurs when the prospect's email address is incorrect, the domain name does not exist, or the sender is suspected as spam and/or has been blocked7. Marketing Cloud Account Engagement marks prospects with hard bounces as undeliverable and prevents any further email sends to them8. A hard bounce is different from a soft bounce, which is a temporary delivery failure due to reasons such as a full mailbox, a server outage, or a message size limit9. Marketing Cloud Account Engagement retries sending emails to prospects with soft bounces until they are delivered or until they reach five soft bounces, after which they are marked as undeliverable