Universal Containers keeps product brochures in Salesforce as files. Sarah shares a public link to a product brochure with potential customers during a meeting. She wants to ensure they do not have access to the file after the meeting.
How should Sarah accomplish this?

Universal Containers has created a Reimbursement Custom Object to capture requests for reimbursement of expenses related to office supplies. The Reimbursement requests are sometimes sensitive and the Team Leads should not have access to the Reimbursement records submitted by the Users in the Call Center Agent role.
The Director of Support will require access to all Reimbursement records. The role hierarchy is set as follows:
Call Center Agent role reports to Team Lead role, which Reports to the Director of Support. Which steps would the Architect take to ensure proper sharing in this Role Hierarchy structure assuming Private Sharing Setting for the Reimbursement Object?