When the command echo $ outputs 1, which of the following statements is true?

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.

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Answer: C