Which of the following is NOT considered an "advanced threat"?

Which of the following is NOT considered an "advanced threat"?

• Zero-day attack
• Advanced persistent threat (APT)
• Zombieware [Please report if the answer is incorrect]
• Polymorphic malware 

EXPLANATION

A zero-day vulnerability is a computer-software vulnerability that is unknown to those who would be interested in mitigating the vulnerability. Until the vulnerability is mitigated, hackers can exploit it to adversely affect computer programs, data, additional computers or a network. An exploit directed at a zero-day vulnerability is called a zero-day exploit, or zero-day attack.

An advanced persistent threat is a set of stealthy and continuous computer hacking processes, often orchestrated by a person or persons targeting a specific entity. An APT usually targets either private organizations, states or both for business or political motives. 

 In computing, a zombie is a computer connected to the Internet that has been compromised by a hacker, computer virus or trojan horse program and can be used to perform malicious tasks of one sort or another under remote direction. Botnets of zombie computers are often used to spread e-mail spam and launch denial-of-service attacks (DOS attacks). Most owners of "zombie" computers are unaware that their system is being used in this way. Because the owner tends to be unaware, these computers are metaphorically compared to fictional zombies. A coordinated DDoS attack by multiple botnet machines also resembles a "zombie horde attack", as depicted in fictional zombie films.

Polymorphic Code is the debut studio album by French one-man band The Algorithm, signed by Basick Records and released on November 19, 2012. Music video for the song Trojans was released on November 7, 2012.