What temporary variables are always available by default in Pattern Design for Infrastructure Discovery Patterns?

The computer_system variable is the correct choice because it is a fundamental component within the context of Pattern Design for Infrastructure Discovery in ServiceNow. When creating infrastructure discovery patterns, the computer_system variable allows the pattern to access crucial information about the discovered computer systems, such as their attributes and configurations. This variable plays a key role in identifying specific details about the systems that the pattern aims to discover and manage, serving as a core reference point for defining and operating the pattern.

In infrastructure discovery, having predefined variables like computer_system simplifies the design process, enabling pattern creators to directly refer to system properties without needing to define them manually within each new pattern. This leads to more efficient pattern development and enhances consistency across different patterns as they operate on the same foundational data structure.

The other variables mentioned, while potentially useful depending on the specific context of the pattern in question, do not have the same ubiquitous or default applicability as the computer_system variable in this scenario. Thus, selecting computer_system reflects an understanding of its essential role in effectively implementing infrastructure discovery patterns within the ServiceNow platform.