A group of options that can be shown together in help output, or restricted to be cooccurring.
Make this group a co-occurring group.
If a groupChoice or groupSwitch option is not called on the command line, use the value of the group with a switch or choice name.
Convert the option to an option group based on a fixed set of values.
Convert the option into a set of flags that each map to an option group.
Set the name and help for this option.
Declare a set of two or more mutually exclusive options.