Explanation:
Automation rules and segmentation rules are both types of Marketing Cloud Account Engagement automation that allow you to perform actions based on criteria. However, the main difference between them is that automation rules run continuously and segmentation rules run once. Automation rules are always on and listening for changes or activity, and they can apply actions to prospects that match the criteria now or in the future. Segmentation rules are designed to pull a one-time list of prospects, then apply the set actions, such as adding them to a list or a Salesforce campaign. Once run, segmentation rules have to be copied to run again

A good default sales ready lead score is 100, as this indicates a high level of interest and engagement from the prospect. Lead scoring is a way of assigning a numerical value to each prospect based on their behavior and profile, such as visiting your website, opening your emails, filling out forms, etc. The higher the score, the more likely the prospect is to buy from you. A lead score of 100 means that the prospect has met all the criteria you have set for a sales ready lead, such as viewing a specific page, requesting a demo, or downloading a white paper. You can customize your lead scoring criteria and thresholds according to your business needs and goals. For more details -> 12

The automatic workflow that can be created to prevent the unassigned prospects from getting assigned is to create an automation rule based on the prospects' time to adjust their score to 0 if they haven't been active in 60 days. An automation rule is a rule that runs continuously in the background and matches prospects based on the criteria you set. You can use an automation 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. However, an automation rule can only match a prospect once in its lifetime, even if the prospect meets the criteria again later. This prevents duplicate or conflicting actions from being applied to the same prospect1. Therefore, an automation rule is ideal for creating a workflow that resets the score of the unassigned prospects who have been inactive for 60 days, and prevents them from getting assigned by another automation rule that assigns prospects based on their score. To create an automation rule, you need to specify the criteria and the actions that you want to execute. For example, you can create an automation rule that matches prospects who have not been assigned to a user, have not had any activity in the last 60 days, and have a score greater than 0, and then use the action Adjust Score to set their score to 0.

The sequence of steps that the Marketing Cloud Account Engagement Administrator should take to automate this process is to enable Visitor Filters for a specific IP range and enable Send daily visitor activity emails. Visitor Filters allow you to filter out the internal traffic from your website analytics, such as your own employees or vendors. By filtering out a specific IP range, you can ensure that only external visitors are tracked by Marketing Cloud Account Engagement. Send daily visitor activity emails allow you to receive a daily email with a list of all the visitors who have visited your website in the past 24 hours, along with their company name, location, and pages viewed. By enabling this feature, you can share the list of external visitors with the regional sales managers automatically

Explanation
These are the default user roles that are included with Marketing Cloud Account Engagement1. They have different levels of access and permissions to perform various tasks in Marketing Cloud Account Engagement. You can also create custom roles from a default role or from scratch.