How Do You Troubleshoot a VirtualBox VM saying “failed unmounting /cdrom”?

Problem scenario
In VirtualBox you are trying to boot a VM, but you get "failed unmounting /cdrom". You see no option to unmount or remove the CD ROM. What should you do?

Possible Solution #1
Restart VirtualBox. Close it. Reopen it.

Possible Solution #2
Reboot the computer hosting/running VirtualBox.

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