Which of the following operating systems do not require extensions on files to execute a program? (Choose two.)
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A. B. C. D. E. F.CF.
The operating systems that do not require extensions on files to execute a program are Unix and Linux.
Unix and Linux systems do not rely on file extensions to determine the type of file or how to execute it. Instead, they use a file's permissions and metadata to determine whether the file is executable and how it should be executed. This is in contrast to Windows operating systems, which typically use file extensions to identify executable files.
Windows operating systems, including Windows 7, Windows 8, and Windows Server 2012, do require extensions on files to execute a program. This is because Windows relies on file extensions to determine the file type and how it should be opened or executed. For example, a file with a .exe extension is assumed to be an executable program.
Android is a mobile operating system based on the Linux kernel, and as such, it also does not rely on file extensions to execute programs. However, since Android apps are distributed as APK files (which have a .apk file extension), this is not relevant to typical Android app installation and execution.
In summary, the correct answers to the question are C. UNIX and F. Linux.