A client is diagnosed with a disorder that has an autosomal dominant inheritance pattern. A review of the client's family history and pedigree does not reveal any ancestors with the disorder. How should the nurse interpret this finding?
◦ Errors have been made in the documentation of the client's history.
◦ Some ancestors experienced effects that were so minor they were not recognized.
◦ A de novo mutation has occurred.
◦ The client's genetic testing should be repeated.