How can the consultant ensure that error notifications are sent only to a specific system admin?

To ensure that error notifications are sent only to a specific system admin, the most effective approach is to uncheck the "Send Apex Warning Emails for other admins" option. This action allows for the configuration of notifications so that while the specific admin remains informed of any errors or warnings, other admins will not receive these notifications. By controlling the distribution of alerts in this way, the consultant can centralize the communication of important issues, which aids in efficient error management without overwhelming other team members with unnecessary emails.

The other options, while potentially relevant, do not directly target the requirement to limit notifications to just one admin. Setting a specific admin in NPSP Settings for notifications could imply that notifications still may go to other users if not properly configured. Disabling error notifications for all but the specific admin risks losing crucial alerts for the organization at large. Changing profiles for users could lead to unintended consequences regarding access and visibility, complicating the notification system without directly addressing the core issue of limiting alerts to one individual.