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The correct response highlights that IIS 6 is natively supported on Windows Server 2003 and Windows XP Professional. When discussing IIS 6, it is essential to recognize that this version of Internet Information Services was designed to function optimally with these specific operating systems. Windows Server 2003 was engineered to enhance server functionality, making it the primary environment for IIS 6, which includes improved performance, security features, and management capabilities compared to earlier versions.

Windows XP Professional was also supported because it was a popular operating system for developers and IT professionals during its time, allowing them to host web applications directly from their workstations. Therefore, choosing this option accurately reflects the systems on which IIS 6 could be operated, helping users understand the historical context of IIS within the Windows ecosystem.

The other options include operating systems that were either released after IIS 6 or did not have the necessary support characteristics to run this version efficiently. Understanding the specific pairing of IIS versions with their respective supported operating systems is crucial for anyone studying web server management or configurations.