Susan is the security manager for a mid-sized insurance company. She got a call from law enforcement, telling her that some computers on her network participated in a massive denial-of-service (DoS) attack. Susan is certain that none of the employees at her company would be involved in cybercrime. Which of the following is the BEST explanation for this scenario?

Her network's machines are being employed as bots, without the knowledge of its users, to perform a distributed denial-of-service (DDoS) attack. Social engineering involves the manipulation of individuals to obtain information. The methods used in social engineering attacks include familiarity, scarcity, and consensus. While there is a minimal possibility that all computers may contain a backdoor, it is highly improbable. Attackers typically automate the process of DDoS using bots rather than manually logging into each machine.