Which system supports communication and facilitates employee collaboration within an organization?

The choice of an Office Automation System as the correct answer highlights its role in enhancing communication and collaboration among employees within an organization. Office Automation Systems include a range of tools and applications that are designed to streamline administrative tasks, facilitate communication, manage documents, and support collaboration through shared resources. This can involve tools like email, shared calendars, word processing, and presentation software, which help staff work together more effectively regardless of their physical location.

The other options, while useful in their respective domains, are not primarily geared towards communication and collaboration. An Expert System focuses on decision-making by simulating human expertise in specific areas, often utilizing artificial intelligence. A Transaction Processing System is designed to handle day-to-day operations and transactions, ensuring accuracy and reliability in financial and operational workflows. A Knowledge Work System is more centered around the creation and management of knowledge through specialized software aimed at professionals like engineers or scientists, rather than wide-scale collaboration among all employees.

In summary, an Office Automation System is explicitly designed to foster communication and collaboration, making it the most suitable choice for this question.