Multiple choice technology operating systems

A script is executing since last 10 minutes and is expected to take another 10 minutes. So I decide to send it to background. Which of the following steps will do it?

  1. Press Ctrl-Z and type "bg"

  2. Press Ctrl-D and type "bg"

  3. Open a new termial and type "bg <pid>" where <pid> is the pid of that script

  4. None of these

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A Correct answer
Explanation

To send a running foreground process to the background, first suspend it with Ctrl-Z (stops it and returns control to the shell), then use 'bg' to resume it in background mode. The job continues running but no longer occupies the terminal or requires user interaction.