This combines option datatype with the matrix datatypes so that the option fields can have multiple columns.  This can be used to create attributes on the backend that are form elements on the front-end.

The datatype is is storing -

A string (used as the title)

An int (to determine radio/checkbox/dropdown type)

An xml field with matrix options -

By using 2 matrix columns an option identifier/option text combination can be used to create a form.

By using 3 matrix columns, one of the columns can also be used to indicate which of the options is the default.

By using 4 columns, one of the columns can indicate whether or not an option is required.