Case escalation rules are a feature that can be used to meet this requirement. Case escalation rules can automatically escalate cases that meet certain criteria, such as being open for more than a specified time or having a certain priority. Escalation rules can assign cases to a different owner or queue and send email notifications to the support manager or other recipients. References:
https://help.salesforce.com/s/articleView?id=sf.case_escalation.htm&type=5

To provide a summary of org's security health, an administrator should run a Health Check that compares org's settings against baseline settings defined by Salesforce Security Baseline Standard or industry standards such as CIS (Center for Internet Security) Benchmark Standard. Health Check generates an overall health score based on how org's settings match with baseline settings for various security categories such as Password Policies, Network Access, Session Settings etc. Health Check also provides recommendations for improving org's security health score by adjusting settings that do not match with baseline settings. Changing Org-Wide Default to private, turning on Event Monitoring, or downloading user login data will not provide a summary of org's security health. References:
https://help.salesforce.com/s/articleView?id=sf.security_health_check.htm&type=5

To automate the process of sending an email notification to the customer when a support rep at Ursa Major Solar closes a case, the following settings should be used:
* Case Close Template in the Support Settings: This feature allows the administrator to define a standard email template that will be automatically sent to the contact associated with the case when it is closed. This ensures consistency in communication and reduces the manual effort required by the support reps.
* Notify Contact Checkbox on Close Page Layout: Adding this checkbox to the case close page layout gives the support reps the option to send an email notification to the contact when closing a case. If the checkbox is checked, the email notification (defined by the case close template) will be sent.
The other options, B (Auto response rule step set 'or status of closed') and D (Add the Knowledge component to the closed layout), do not directly address the requirement of sending an email notification when a case is closed.
References:
* Salesforce Help: Automate Case Management
* Salesforce Help: Case Support Settings

Before save flows only support four elements: Assignment, Decision, Get Records, and Loop.
References: https://help.salesforce.com/s/articleView?id=sf.flow_ref_elements.htm&type=5

To make it easy for approvers to respond to approval requests, the administrator should configure three settings:
* Update the organization's chatter setting to allow approvals, which enables approvers to approve or reject requests from chatter feeds or email notifications
* Enable the organization's Email approval response setting, which allows approvers to reply to approval request emails with keywords such as APPROVE or REJECT
* Add the Items to approve component to the approvers home page, which shows a list of pending approval requests that can be acted upon with one click Specifying initial submission actions within the approval process will not affect how approvers respond to requests. Creating a flow to automatically approve all records will bypass the approval process altogether. References:
https://help.salesforce.com/s/articleView?id=sf.approvals_considerations.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.approvals_email.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.approvals_one_click.htm&type=5