What type of intrusion is characterized by slower computer performance, random crashes, and unusual graphic displays?

The type of intrusion characterized by slower computer performance, random crashes, and unusual graphic displays is best described as a system intrusion. This category refers to attacks that target the operating system of a device, manipulating the essential processes and resources that govern the system's functionality.

When an operating system is compromised, it can lead to significant performance degradation. For instance, malicious software may consume system resources such as CPU and memory, leaving fewer resources for legitimate applications. This can result in noticeable slowdowns and reduced efficiency during normal operations.

Random crashes can also be a direct result of system-level intrusions, as attackers may install malware that interferes with critical system processes or alters essential files, leading to instability. Unusual graphic displays, such as distorted visuals or unexpected pop-ups, might indicate that malicious code is affecting the graphics rendering or user interface components, further confirming the presence of system-level issues.

In contrast, file system intrusions primarily target the storage structure of a system, potentially leading to data loss or corruption without necessarily affecting performance or graphical output in the same way. Network intrusions are focused on communications and data transmission but do not directly relate to local system performance or crashes. Therefore, the symptoms described align most closely with system intrusions.