What is the unistd symbolic constant for the standard error?STDOUT_FILENOSTDIN_FILENOSTDERR_FILENOI don't knowSubmit

What is the unistd symbolic constant for the standard output?STDERR_FILENOSTDIN_FILENOSTDOUT_FILENO

What is standard error in Linux?1 pointError messages returned by the operating system through the shellA Linux command that outputs a specified string of textInformation received by the operating system via the command lineInformation returned by the operating system through the shell

Which symbol should I use to redirect the error output to the standard output?

ShellWhich symbol should I use to redirect the error output to the standard output?

Which symbol should I use to redirect the error output to the standard output?2>1>&22>&1I don't know