Which Unix-like OS kernel released in 1991 under free/open-source distribution?

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Multiple Choice

Which Unix-like OS kernel released in 1991 under free/open-source distribution?

Explanation:
This question is about a Unix-like kernel that appeared in 1991 with a free/open-source license. Linux fits perfectly: Linus Torvalds released the Linux kernel in 1991 and it was distributed under the GNU General Public License, which guarantees free use, study, modification, and redistribution. Its design is Unix-like, drawing on Unix principles and aiming for a POSIX-style environment when paired with GNU userland tools. That combination—a Unix-inspired kernel released in 1991 under a free/open-source license—explains why this is the correct answer. The other options don’t match because they refer to systems that aren’t Unix-like in that context or weren’t released under a free/open-source license at that time.

This question is about a Unix-like kernel that appeared in 1991 with a free/open-source license. Linux fits perfectly: Linus Torvalds released the Linux kernel in 1991 and it was distributed under the GNU General Public License, which guarantees free use, study, modification, and redistribution. Its design is Unix-like, drawing on Unix principles and aiming for a POSIX-style environment when paired with GNU userland tools. That combination—a Unix-inspired kernel released in 1991 under a free/open-source license—explains why this is the correct answer. The other options don’t match because they refer to systems that aren’t Unix-like in that context or weren’t released under a free/open-source license at that time.

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