Scott works as a network security administrator for a company that creates advanced routers and switches. He has noticed that his company's networks have been subjected to a series of advanced attacks over a period of time. Which of the following BEST describes this attack?

An advanced persistent threat (APT) involves sophisticated (i.e., advanced) attacks over a period of time (i.e., persistent). A distributed denial-of-service (DDoS) could be a part of an APT, but in and of itself is unlikely to be an APT. Brute force attempts every possible random combination to get the password or encryption key. In a disassociation attack, the attacker attempts to force the victim into disassociating from a resource.