This indicates the third major update to Mavericks, which was released in May 2014, known for improving 4K display support and syncing capabilities [1].
This likely refers to the installation method, indicating it was downloaded and installed via the Mac App Store. Mavericks — 10.9.3 (App Store) [Intel]
This is OS X 10.9, released by Apple in 2013 [1]. This indicates the third major update to Mavericks,
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