What is the latest version of OS X referred to?

The correct answer is that the latest version of macOS, previously known as OS X, is referred to as Big Sur. Big Sur was a significant update that introduced a new design language and several performance improvements. It's important to note that while Mavericks, Yosemite, and High Sierra are notable past versions of macOS, they are not the most recent iteration as of now.

Mavericks (OS X 10.9), Yosemite (OS X 10.10), and High Sierra (macOS 10.13) were all important releases in their own right, but they do not reflect the current state of Apple's operating system. Understanding the timeline of these updates helps clarify the progression of macOS and the features introduced with each version, making it easier for individuals preparing for the ACMT certification to recognize the evolution of Apple's software.