When the command echo $ outputs 1, which of the following statements is true?
A.
It is the process ID of the echo command.
B.
It is the process ID of the current shell.
C.
It is the exit value of the command executed immediately before echo.
D.
It is the exit value of the echo command.
The correct question is:
“When the command ‘echo $?’ outputs 1, which of the following statements is true?”
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