[A]
The simplest way to start a background process is to add an ampersand (&) at the end of the command
[B]
The simplest way to start a background process is to add an nice command at the beginning of the foreground process command
[C]
The simplest way to start a background process is to add an ampersand (&) at the beginning of the foreground process command
[D]
The simplest way to start a background process is to add fg command at the beginning of the foreground process command