Generally, in a Linux system with Bourne-like shell, which of folowing methods does NOT make a program run in background?

A. Adding a “&” at the end of the command line.
B. Pressing “Ctrl+Z” when the program is running in the foreground, and then using the system
command “bg”
C. Starting a program to fork a child process, executing the program form child process by calling
the system libray function, and then terminating the parent process.
D. Pressing “Ctrl+S” when the program running in the foreground.
E. None of the above.

I tried some methods mentioned in the above quesion on Linux.seemed did not work.

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