What does 'shutdown -r -f -t 03' at a Windows command line do?

It shuts down all your open applications after 3 seconds, and then shuts down your PC.

It asks you to shut down all your open applications after 3 seconds, and then restarts the PC.

It shuts down all your open applications after saving them after 3 seconds, and then restarts the PC.

It forcibly shuts down all your open applications after 3 seconds, and then restarts the PC.

Answer:
It forcibly shuts down all your open applications after 3 seconds, and then restarts the PC.

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