Panther (10.3), Jaguar (10.2), Puma (10.1), and Cheetah (10.0) are examples of _______?

Panther (10.3), Jaguar (10.2), Puma (10.1), and Cheetah (10.0) are examples of _______?
[A]Windows OS
[B]Mac OS
[C]Open Operating Systems
[D]None of these
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