Explanation
Case escalation rules are used to escalate cases that have not been resolved within a certain time frame by changing the case owner, sending email notifications, or triggering workflow actions. You can use these actions to alert the appropriate users or groups when a case needs urgent attention or escalation. References:
https://help.salesforce.com/s/articleView?id=sf.customize_caseesc.htm&type=5

Explanation
A validation rule is a tool that allows administrators to enforce data quality and integrity by preventing users from saving records that do not meet certain criteria or conditions. For example, a validation rule can display an error message if a user enters an invalid value in a field. In this case, the administrator can create a validation rule on the account object that displays an error if the account annual revenue field is below 0 or greater than 100 billion. References:
https://help.salesforce.com/s/articleView?id=sf.validation_rules.htm&type=5

Explanation
Two reasons that would prevent a user from being deactivated are that the user is part of a territory hierarchy or that the user is assigned in workflow email alert. A territory hierarchy is a structure that defines how territories are related to each other in Salesforce; if a user is part of a territory hierarchy, they cannot be deactivated until they are removed from all territories. A workflow email alert is an action that sends an email to one or more recipients when a workflow rule is triggered; if a user is assigned in workflow email alert, they cannot be deactivated until they are removed from all email alerts. The user being in a custom hierarchy field or being the highest role in role hierarchy are not reasons that would prevent deactivation; they may affect data visibility or record ownership after deactivation, but they do not block deactivation itself. References:
https://help.salesforce.com/s/articleView?id=sf.users_deactivate_considerations.htm&type=5

Explanation
To identify new leads entered by interns from existing leads, the administrator should define a record type and assign it to the interns. This will allow them to select a different record type when creating leads, and distinguish them from other leads based on record type. Setting up Web-to-Lead form will not work if the interns are entering leads manually in Salesforce. Creating a separate Lead Lightning App or updating the active Lead Assignment Rules will not affect lead identification. References:
https://help.salesforce.com/s/articleView?id=sf.customize_recordtype.htm&type=5

Explanation
Contact, lead, and person account are three objects that will have the individual field available for tracking data privacy information when data protection and privacy is enabled for an org. The individual object is an object that stores data privacy preferences and requests for customers who are subject to privacy regulations such as GDPR; it can be linked to contact, lead, or person account records using the individual field. Case and opportunity, account and user, or individual, user, and account are not combinations of objects that will have the individual field available for tracking data privacy information; they either do not store customer data or do not support individual object relationships. References:
https://help.salesforce.com/s/articleView?id=sf.individual_object.htm&type=5