Which of the following is not considered a threat to computer security?

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A banner ad is primarily a marketing tool used to promote products or services on websites, and it does not inherently pose a threat to computer security. While some banner ads can lead to malicious sites or contain malicious code, a standard banner ad itself is not designed to harm or compromise a computer system.

In contrast, Trojan horses, spyware, and malware are all types of software specifically created to infiltrate and exploit a computer system. Trojan horses disguise themselves as legitimate software to trick users into installing them, spyware secretly collects user data or monitors their activities, and malware is a broad category that includes any malicious software designed to cause harm or unauthorized actions on a computer. These are clear threats to security, unlike benign advertisements that primarily serve promotional purposes.