Which action would be the least helpful for Rolando concerned about his browsing history?

Disabling cookies in the browser's privacy settings is the least helpful action for Rolando concerned about his browsing history because cookies are primarily used to store information about user sessions and preferences rather than directly impacting the visibility of browsing history. While disabling cookies may enhance privacy by preventing websites from tracking user behavior or remembering login information, it does not prevent the browser from saving the actual history of sites visited.

In contrast, using a private browser, clearing browser history regularly, and adjusting privacy settings to strict all directly address the management of browsing history. A private browser mode typically does not save any browsing history during the session, while clearing history keeps the list of visited sites minimal. Adjusting privacy settings to strict can limit tracking and enhance overall privacy during web sessions. Therefore, focusing solely on cookies does not effectively address Rolando's concerns about his browsing history.