A nurse is teaching a class about medically futile treatment. The nurse should include which of the following as an example of medically futile treatment?

Administering chemotherapy to a client who has metastatic cancer.

Administering oral care for a client who has post-chemotherapy mucositis.

Administering an antiemetic to a client who has post-chemotherapy nausea.

Administering a narcotic analgesic to a client who has end-stage cancer.