A user deletes a suspicious email from an unknown address. Which of the following security best practices is being applied?

Anti-malware software detects and removes malicious software, but the act of deleting a suspicious email by a user is a preventative human action, not solely an anti-malware function.

Anti-phishing involves identifying and preventing attempts to trick users into revealing sensitive information, often through suspicious emails designed to look legitimate. By deleting a suspicious email from an unknown address, the user is actively avoiding a potential phishing attempt and applying a key anti-phishing best practice.

Authentication is the process of verifying a user's identity, which is not directly related to handling a suspicious email.

A firewall controls network traffic based on security rules and is a network-level defense, not a user action related to handling specific emails.