Which shell command is used to continue background execution of a suspended command?

The `&` symbol is used to start a command in the background initially, not to resume a suspended one.

When a command is suspended (typically by pressing Ctrl+Z), the `bg` (background) command can be used to resume its execution in the background, allowing the user to regain control of the shell while the job continues running.

`cont` is not a standard shell command for continuing background execution of suspended jobs.

`exec` replaces the current shell with the specified command, it does not resume suspended jobs.

`:` is a no-operation command and `:&` is not a standard shell command for job control.