Which of the following describes the attributes of a typical bot controlled by a botnet?

A typical bot controlled by a botnet is best described as infected and remotely controlled. This reflects the nature of how botnets operate: individual devices, often referred to as "bots," become compromised through various means, such as malware infection or exploitation of vulnerabilities. Once infected, these devices are then controlled by a central command and control server operated by the attacker.

The term "remotely controlled" indicates that the botnet operator can send commands to the infected devices from afar, directing them to perform various tasks. These tasks can include sending spam emails, participating in distributed denial-of-service (DDoS) attacks, or extracting sensitive data from other systems. This remote control aspect is fundamental to the functioning of botnets, as it allows the attacker to orchestrate large-scale malicious activities using a decentralized network of compromised systems.

In contrast, the other options do not accurately represent the typical characteristics of a bot. For instance, while some bots may employ encryption, it is not a defining attribute of all bots. Meanwhile, being independent and secure suggests a level of integrity and autonomy that is not present in infected devices. Lastly, the terms autonomous and self-repairing imply features that are more advanced and not typical for standard bots within a botnet,