Final answer:
The Processor Card is NOT an available I/O card for the System 6000; it is instead responsible for processing data within a computer system, distinguishing it from I/O components.
Step-by-step explanation:
The question asks which option is NOT an available Input/Output (I/O) card for the System 6000. The available types of I/O cards typically include an Input Card and an Output Card. These components are essential for the system to communicate with external devices, allowing for data entry and retrieval. However, a Processor Card and a Memory Card are not considered I/O cards. A Processor Card is concerned with the processing of data and instructions within a computer system, while a Memory Card is related to the storage of data. The correct answer is C) Processor Card, as it is not categorized as an I/O card.