[Solved] The primary characteristics of a solid infrastructure include flexibility, scalability, reliability, availability, and performance. Software: A set of computer programs that enable the hardware to process data. GUI: Graphical User Interface, a human-computer interface that allows users to interact with electronic devices using graphical icons and visual indicators. Visible Objects: Items or entities that can be seen by the naked eye under normal lighting conditions. Complex Commands: Advanced or intricate instructions that are given to computers or software to perform specific operations.