What Information Is Shown by the Echo $? Command

What information is shown by the echo $? command?

A) The process ID of the echo command. The process ID of the echo command.
B) The exit value of the command executed immediately before echo. The exit value of the command executed immediately before echo.
C) The process ID which will be used for the next command.
D) The exit value of the echo command. The exit value of the echo command.
E) The process ID of the current shell.

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