The default Reset method in Struts ActionForm does not set properties to null or default values. Instead, it resets the form to its initial state by repopulating properties with original values from the request parameters. However, this description is not exactly what the default reset() does - the default reset() method is actually empty and does nothing. Options B and C have formatting issues with 'b.' and 'c.' prefixes, making 'None of the above' the best choice.