Which of the following attacks can be mitigated by providing proper training to the employees in an organization?

Social engineering relies on manipulating people through deception, impersonation, or psychological pressure - tactics such as phishing, pretexting, and baiting that target human behavior rather than systems. Because the human is the attack surface, technical controls alone cannot fully prevent these attacks. Proper training teaches employees to recognize manipulation tactics, verify identities, and follow secure procedures, directly reducing the attack vector.

A Smurf attack is a network-level DDoS amplification attack using ICMP broadcast traffic and is mitigated through network device configuration such as disabling directed broadcasts, not employee training.

A denial-of-service attack targets system or network availability through traffic flooding and requires technical countermeasures such as rate limiting, filtering, and redundancy to mitigate.

A man-in-the-middle attack is mitigated through technical controls such as mutual authentication, TLS certificate validation, and encrypted protocols, not primarily through employee training.