Who is credited with developing the earliest version of Mac OS?

The earliest version of Mac OS, originally known as System Software, was developed by Steve Jobs and Steve Wozniak while at Apple Inc. Their work on the Macintosh project in the early 1980s led to the release of the first Macintosh computer in 1984, which featured this operating system. This software was revolutionary for its graphical user interface (GUI), which distinguished it from the command-line interfaces prevalent at the time. Jobs and Wozniak's innovation in user-friendly design and integration of features laid the groundwork for future operating systems at Apple and greatly influenced the computer industry as a whole. The other choices involve individuals associated with other companies and developments unrelated to the creation of Mac OS.