Answer: D
Shellshock, also known as the Bash or Bashdoor vulnerability, was a major security flaw discovered in September 2014. It affected the Bash shell, which is commonly found in Unix-based operating systems, such as Linux, Unix, and OS X (now macOS). Windows, on the other hand, does not use the Bash shell by default and was not directly affected by the Shellshock vulnerability.
https://www.techtarget.com/searchsecurity/definition/Shellshock
"Shellshock is the common name for a coding vulnerability found in the Bash shell user interface that affects Unix-based operating systems, including Linux and Mac OS X, and allows attackers to remotely gain complete control of a system."
It doesn't affect Windows therefore D
Mac OS X (now known as macOS) is built on an open-source Unix-like operating system kernel known as Darwin. It is able to run Bash shell, hence vulnerable to Shellshock.
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