A companys legal and regulatory departments have drafted a new policy in which emails must be retained for no longer than three years. Which of the following locations should an administrator…

Emails can be downloaded and stored locally on workstations in mail clients (e.g., PST files), so these locations must be managed by the retention policy.

Backup tapes often contain snapshots of email servers or user data, including emails, and must adhere to the retention policy to avoid unauthorized long-term storage.

Domain controllers store user authentication information and network policies, but they do not typically store email messages themselves.

The primary email server is where emails are stored in mailboxes, and it is the central point for configuring and enforcing retention policies for active mail data.

An SMTP gateway processes email in transit but does not usually store emails for long-term retention purposes that would violate a policy.

A proxy server mediates network connections and can cache web content, but it does not store emails in a way that requires retention policy configuration.