The correct answer is:
✅ A. Record setting and search index

💡 Explanation:

Even if users can’t see list views or the tab, they might still find records in global search if the records are indexed and the users have visibility through sharing rules or permissions.

To completely prevent access, the admin must:

Adjust record-level access settings

Change the Organization-Wide Default (OWD) for the object (Deals) to Private, or

Remove sharing rules, permission sets, or profile access that grant visibility to those records.

Update search index visibility

When records are visible in search, it’s because Salesforce has indexed them for users who have access.

Once record access is removed, the search index will automatically update to exclude those records — ensuring they can’t be found through search.