What is the output of the following command? echo $?

Question

What does the variable "$?" expand to?

Accepted Answer

Expands to the exit status of the most recently executed foreground command.

Answer

Expands to the last argument passed to a shell script or function call

Answer

Expands to the number of arguments passed to a shell scripts or function call

Answer

Expands to the exit status of the most recently executed background command.

Question from the Linux test