Carl is a 78-year-old male admitted to a medical/surgical unit. Three days ago, when you had last worked with Carl, you noted him to be in good spirits. Upon your return to your unit, Carl tells you in a disorganized manner that the FBI is bugging his phone, and Carl is unable to answer your questions giving you unrelated answers to your questions. As his assigned nurse, you query the potential for: a. An undiagnosed mental health disorder b. Paranoid schizophrenia c. Sudden onset dementia d. Delirium secondary to an underlying medical condition