An 80-year-old male client is brought to the emergency room by his son with a preliminary diagnosis of dehydration. The client is agitatedWhen the nurse asks the client to open his mouth for an oral exam, the client yells, "You don't need to look in my mouth to see what is wrong with me!" The nurse's best rationale for looking in his mouth is: 1. That a complete physical exam must be performed.2. To assess for poorly-fitting dentures.3. To assess for oral lesions.4. To assess mucous membranes.